exam Maths Puzzle

A train running at the speed of 20m/s crosses a pole in 24 sec less than the time it requires to cross a platform thrice its length at the same speed. What is the length of the train?

A.

150 m

B.

200 m

C.

180 m

D.

160 m

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exam Other Question

A jet plane is rising vertically with a velocity of 10m/s. It has reached a certain height when the pilot drops a coin, which takes 4sec to hit the ground. Assuming that there is no resistance to the motion of the coin, the height of the place and the velocity of the coin on impact with the ground are:

A.

38.4 m, 28.7 m/s

B.

38.4 m, 29.2 m/s

C.

26.5 m, 13.5 m/s

D.

26.5 m, 28.7 m/s If the wheel of a bicycle makes 560 revolutions in travelling 1.1 km, what is its radius?

A.

31.25 cm

B.

37.75 cm

C.

35.15 cm

D.

11.25 cm