By how much per cent must a motorist increase his speed in order to reduce by 20%, the time taken to cover a certain distance?
A). 25
B). 35
C). 45
D). 55
25
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1. A train 160 metres long passes a standing man in 18 seconds. The speed of the train is
2. Two trains started at the same time, one from A to B and the other from B to A . If they arrived at B and A respectively 4 hours and 9 hours after they passed each other the ratio of the speeds of the
3. A man observed that a train 120 m long crossed him in 9 seconds. The speed (in km /hr) of the train was
4. A boy is late by 9 minutes, If he walks to school at a speed of 4 km / hour. If he walks at the rate of 5 km/ hour, he arrives 9 minutes early. The distance to his school is
5. Two persons start simultaneously from A and B towards B and A respectively. The first person reached B in 10 minutes and the second person reached A in 15 minutes from the time of their start. In how
6. A bike covers a distance of 1856 km in 29 hours. What is the speed of the bike ?
7. Two trains 121 meters and 165 meters in length respectively are running in opposite directions, one at the rate of 80 km and the other at the rate of 65 kmph. In what time will they be completely clea
8. A man crosses a road 250 metres wide in 75 seconds. His speed in km/hr is :
9. A man in a train notices that he can count 21 telephone posts in one minute.If they are known to be 50 meters apart , then at what speed is the train travelling ?
10. The speed of a car increases by 2 kms after every one hour. If the distance travelling in the first one hour was 35 kms. what was the total distance travelled in 12 hours?
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