exam Maths Puzzle

A boat goes 30 km. upstream and 44 km. downstream in 10 hours. In 13 hours, it can go 40 km upstream and 55 km down-stream. The speed of the boat in still water is:

A.

3 km/hr

B.

4 km/hr

C.

8 km/hr

D.

6 km/hr

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exam Other Question

A man jogging inside a railway tunnel at a constant speed hears a train approaching the tunnel from behind at a speed of 30km/h, when he is one third of the way inside the tunnel. Whether he keeps running forward or turns back, he will reach the end of the tunnel at the same time the train reaches that end. The speed at which the man is running is:

A.

6 km/hr

B.

8 km/hr

C.

12 km/hr

D.

10 km/hr A train left station X at A hour B minutes. It reached station Y at B hour C minutes on the same day, after travelling C hours A minutes (clock shows time from 0 hours to 24 hours). Number of possible value(s) of A is:

A.

0

B.

1

C.

2

D.

3