exam Maths Puzzle

A, B and C start simultaneously from X to Y. A reaches Y, turns back and meet B at a distance of 11 km from Y. B reached Y, turns back and meet C at a distance of 9 km from Y. If the ratio of the speeds of A and C is 3:2, what is the distance between X and Y?

A.

99 m

B.

100 m

C.

120 m

D.

142 m

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exam Other Question
From a point P, on the surface of radius 3cm, two cockroaches A and B started moving along two different circular paths, each having the maximum possible radius, on the surface of the sphere, that lie in the two different planes which are inclined at an angle of 45 degree to each other. If A and B takes 18 sec and 6 sec respectively, to complete one revolution along their respective circular paths, then after how much time will they meet again, after they start from P?

A.

27 sec

B.

24 sec

C.

18 sec

D.

9 sec
A can do piece of work in 30 days while B alone can do it in 40 days. In how many days can A and B working together do it?

A.

16
1
7

B.

17
1
7

C.

18
1
7

D.

19
1
7