Discuss Forum
1. A train covers a distance of 10 km in 12 minutes. If its speed is decreased by 5 km/hr, the time taken by it to cover the same distance will be :
- A. 13 min 20 sec
- B. 13 min 20 sec
- C. 13 min 20 sec
- D. 13 min 20 sec
Answer: Option A
Explanation:
Hints:
speed of the train = distance / time
= 10 / ( 12/60) = 10× 60 / 12 = 50 km/h
Now speed = 45 km/h
Required time = 10 / 45 hour
= (2× 60)/ 9 = 40 /30 minutes = 13 minutes 20 second
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