exam Maths Puzzle

P beats Q by 5 seconds in a race of 1000m and Q beats R by 5 metres in a race of 100m. By how many seconds does P beats R in a race of 1000 m?

A.

5 sec

B.

7 sec

C.

10 sec

D.

Cannot be determined

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exam Other Question
Rajesh walks to and fro to a shopping mall. He spends 30 minutes shopping. If he walks at speed of 10 km an hour, he returns to home at 19.00 hours. If he walks at 15 km an hour, he returns to home at 18.30 hours. How fast must he walk in order to return at 18.15 hours?

A.

17 km/hr

B.

18 km/hr

C.

19 km/hr

D.

20 km/hr
A bus without stopping travels at an average speed of 60 km/hr and with stoppages at an average speed of 40 km/hr. What is the total time taken by the bus for stoppages on a route of length 300km?

A.

4 hr

B.

3 hr

C.

2.5 hr

D.

3.5 hr