IF a catamaran travel at a speed of 20 km per hour in stillwater. So when it travel at a downstream speed 5 kilometre per hour. What will be the time taken by it to travel 90 km.

Since the catamaran is travelling in downstream the speed of the stream as a pin the speed of the ship so its speed is equals to catamaran speed+downstream speed. Which becomes 20+5=25 km/he. Now by applying a formula we get

Time=90/25. We get our answer which is 3.6

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What is the unit digit in the product (365 x 659 x 771)?

Unit digit in 34 = 1 Unit digit in (34)16 = 1

Unit digit in 365 = Unit digit in [ (34)16 x 3 ] = (1 x 3) = 3

Unit digit in 659 = 6

Unit digit in 74 Unit digit in (74)17 is 1.

Unit digit in 771 = Unit digit in [(74)17 x 73] = (1 x 3) = 3

Required digit = Unit digit in (3 x 6 x 3) = 4

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In following questions, one term in number series is incorrect.

Find out the incorrect number

11, 2, 21, 3, 32, 4, 41, 5, 51, 6

Find out the incorrect number

11, 2, 21, 3, 32, 4, 41, 5, 51, 6

The given sequence is a combination of two series:

I. 11, 21, 32, 41, 51 and

II. 2, 3, 4, 5, 6.

Clearly, the pattern in I is + 10.

So, 32 is wrong and should be replaced by (21 + 10) i.e. 31.

A family consists of 6 member P, Q, R, X, Y and Z . Q is a son of R but R is not mother of Q. P and R a married couple. Y is the brother of R. X is a daughter of P. Z is a brother of P. Who is the brother in law of P?

Q is son of R but R is not a mother. So, R is the father of Q. P is married to R. So, P is the wife of R and the mother of Q . X is a daughter of P and hence, of R and so she is a sister of Q. Y is a brother of R and Z is a brother of P. R is husband of P and Z brother of P.

R is the husband of P and Z is a brother of P. R is husband of P and Y is brother of R so, Y is brother in law of P.

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In following number series, two terms have been put within brackets. Choose the appropriate option

Choose the appropriate option 2, 3, (6), 11, 18, (30), 38

Choose the appropriate option 2, 3, (6), 11, 18, (30), 38

The correct sequence is + 1, + 3, + 5, + 7, + 9, + 11.

Clearly, the term 6 is correct,

But, 30 is wrong and should be replaced by (18 + 9) i.e. 27.

A, B, C, D, E, F and G are members of a family consisting of 4 adults and 3 children, 2 of whome, F and G are girls . A and D are brothers and A is a doctor. E is an engineer married to one of the brothers and has two children. B is married to D and G is there child. Who is C ?

E is married to A or D. But B is married to D. Thus, E is married to A. Thus, A, B, D, E are the 4 adults and C, F, G are the three children in the family. B and D have a child G. A and E have two children. They are C and F. Now, only F and G are girls. So, C is a boy. Thus, C is A's or E's son..

A + B means A is the son of B.

A -B means A is the wife of B.

A x B means A is the brother of B.

A x B means A is the mother of B.

A=B means A is the sister of B.

What does P x RÃ· Q mean?

P Ã—R Ã·Q means p is the brother of R who is the mother of Q i. e. He is uncle of Q.

So, the answer is( C).

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. A man has a certain number of small boxes to pack into parcles. If he packs 3, 4, 5 or 6 in a parcel, he is left with one over; if he packs 7 in a parcle, none is left over. What is the number of boxes, he may have to pack?

Clearly, the required number would be such that it leaves a remainder of 1 when divided by 3, 4, 5, or 6 and no remainder when divided by 7. Thus, the number must be of the form (L.C.M of 3, 4, 5, 6) x + 1 i.e., (60x + 1 ) and a multiple of 7. Clearly, for x = 5, the number is a multiple of 7. So the number is 301.

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84, 78, 72, 66, 60, 54, 48, ?, ?

What numbers should come next?

What numbers should come next?

In this simple subtraction series, each number is 6 less than the previous number.

Rule = (1st number), (1st no. - 6 = 2nd no.), (2nd no. - 6 = 3rd no.). . .

Now in our case,

(84), (84 - 6 = 78), (78 - 6 = 72), (72 - 6 = 66), (66 - 6 = 60), (60 - 6 = 54), (54 - 6 = 48), (48 - 6 = 42), (42 - 6 = 36).

So the answer is B = 42, 36.