a) 10 hours
b) 20 hours
c) 5 hours
d) 2.5 hours
Answer: d
Explanation: Since, the train travels at 60 km/h, it’s speed per minute is 1 km per minute. Hence, if it’s speed with stoppage is 40 km/h, it will travel 40 minutes per hour i.e. train stops 20 min per hour.
Time taken to travel 300 km with stoppage
$$ = \frac{{300}}{{40}} = 7.5\,\,{\text{hours}}$$
Time taken for stoppage as it stops for 20 min per hour
= 7 × 20 + 10
= 140 + 10
= 150 minutes.
= $$\frac{{150}}{{60}}$$ hours = 2.5 hours.
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