A boy crosses a 300 meters wide road in 30 seconds. What is his speed (in km/hr)?1). 182). 543). 364). 27
Distance = 300 m and time = 30 sec
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1. A car A with 100 km/hr crosses a bridge in 36 seconds. Another car B 100 metres shorter crosses the same bridge at 36 km/h. What is the time taken by the second car to cross the bridge?
2. A locomotive driver travelling at 81 km/hr finds a signal 280 metres ahead of him indicating that he should stop. He instantly applies brakes to stop the train. The train retards uniformly and stops 10 metres before the signal post. What time did he take to stop the train?
3. A 170 m long train is running at a speed of 70 km/hr on a bridge made above a river. A 10 m long boat is running downstream in the river and in the opposite direction of the train, such that the train crossed the boat in 7.2 seconds. If the speed of the stream is 4 km/hr, how much time will the boat take to cover a distance of 60 km upstream?
4. Two trains travel from A to B and B to A in 6 and 10 hours respectively. They start simultaneously at 10 a.m.. If the first train meets with an accident and thereafter reduces its speed to half of the original speed, it meets with the second train at 2 p.m.. At what time did the accident occur?
5. A man travels for 5 hr and 15 min if he cover the first half of the journey at 60 km/hr and the rest at 45 km/hr speed. Find the total distance covered.
6. A missile travels at 1278 km/h. How many metres does it travel in one second?
7. An aeroplane travels distance 2500 km, 1200 km and 500 km at the rate of 500 km/hr, 400 km/hr and 250 km/hr respectively. The average speed is
8. An express train crosses a bridge half of its length in 15 seconds and the same train crosses a platform of length 200 m in 20 seconds, then find the speed of the train in meter/seconds.
9. A 600-meter-long train crossed a man who is standing at a 1200-meter-long platform in 24 seconds. Find how much time will train take to cross the platform.
10. Vinay covers 560 km at a speed of 70 km/hr and the next 240 km at a speed of 120 km/hr. What is his average speed?
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