A car travels first half distance between two places with a speed of 40 kilometre per hour and rest of half distance with a speed of 60 km per hour. The average speed of car is:

Let the total distance covered be"s" km.

Total time taken,

=(s/2)/30+(s/2)/60

=3s/120

Average speed,

=s/(3s/120)

=s(120/3s)

=40 km/hr

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Find out the missing number in the following sequence:

1, 3, 3, 6, 7, 9, ?, 12, 21.

1, 3, 3, 6, 7, 9, ?, 12, 21.

Clearly, the given sequence is a combination of two series:

I. 1, 3, 7, ?, 21 and II. 3, 6, 9, 12

The pattern followed in I is + 2, + 4, ...; and

the pattern followed in IIis + 3.

Thus, missing number = 7 + 6 = 13.

Hence, the answer is (D)..

In farm there is 2 ducks,6 cats ,4 dogs . Each weight of duck 4 kg, cat 4 kg and dog 7 kg what is the average weight of all animals?

={( number of ducks Ã— weight)+( number of dogs x weight)}/ total animals

= 5 kilogram is average weight of all animals.

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In following alphabet series , one term missing as shown by question mark . Choose missing term from options.

A, Z, X, B, V, T, C, R, ?, ?

The first, fourth and seventh letters are in alphabetical order. So, tenth letter would be the letter after C i.e. D. Also, the second and third letters are alternate and in reverse order and so are the fifth and sixth letters and the eighth and ninth letters.

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If a boat travels with a speed of 8 km per hour in still water and the speed of stream is 3 kilometre per hour what would be the time taken by the boat to go 555 kilometre downstream?

Downstream speed=(x+y)

8+3=11 km/hr

Time=distance/speed

55/11=5 hrs

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A family consists of six members P, Q, R, S, T and U. There are two married couples. Q is a doctor and the father of T. U is grandfather of R and is a contractor. S is grandmother of T and is a housewife. There is one doctor, one contractor, one nurse, one housewife and two students in the family. Who is the sister of T?

Q, the Doctor, is the father of T. S, the Housewife, is the grandmother of T and hence the mother of Q. Since there are only two married couples one being that of Q, the grandfather of R i.e., U must be married to S. Thus, R and T will be both children of Q and these must be the students. So, P, who remains, shall be the wife of Q and she alone can be the nurse. Thus, U must be the contractor.

Clearly, R and T are children of same parents. So, R will be the sister of T.

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

Find out the incorrect number

1, 5, 5, 9, 7, 11, 11, 15, 12, 17

Find out the incorrect number

1, 5, 5, 9, 7, 11, 11, 15, 12, 17

The given sequence is a combination of two series:

I. 1, 5, 7, 11, 12 and

II. 5, 9, 11, 15, 17

The pattern in both I and II is + 4, + 2, + 4, + 2.

So, 12 is wrong and must be replaced by (11 + 2) i.e. 13..

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

Choose the appropriate option 3, 10, 29, (66), (127), 218

Choose the appropriate option 3, 10, 29, (66), (127), 218

The sequence is 1

Clearly, both the terms 66 and 127 are correct..

A + B means A is the father of B.

A -B means A is the wife of B.

A x B means A is the brother of B .

A Ã· B means A is the daughter of B.

If P + Q which of the following is true?

P + RÃ·Q means P is the father of R who is the daughter of Q i.e P is the father of R and Q is the mother of it is the husband of Q..