exam Maths Puzzle

A boat covers a distance of 30km downstream in 2 hour while it takes 6 hour to cover the same distance upstream. What is the speed of the boat in km/hr

A.

5

B.

7.5

C.

10

D.

12

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exam Other Question

A hare sees a dog 200m away from her and scuds off in opposite direction at a speed of 24 km/hr. Two minutes later the dog perceives her and gives chase at a speed of 32km/hr. How soon will the dog overtake the hare, and what distance from the spot from where the hare took flight?

A.

8 min, 2 km

B.

7.5 min, 2 km

C.

7.5 min, 3km

D.

7.5 min, 2.5km
A and B start running simultaneously. A runs from point P to point Q and B from point Q to point P. A's speed is 6/5 of B's speed. After crossing B, if A takes 5/2 hr to reach Q, how much time does B take to reach P after crossing A?

A.

3 hr 6 min

B.

3 hr 16 min

C.

3 hr 26 min

D.

3 hr 36 min