Without any stoppage average speed of a train is 90 km/hr and with stoppage average speed reduces to 70 km/hr . Find the total time of stoppage in total 3 hours .
Answer & explanation
Correct answer: option 4
Distance = Speed × Time
Distance covered by train without any stoppage in 3 hours = 90 km/hr × 3 hr
= 270 km
But it travelled = 70 km/hr × 3 hr = 210 km
Time taken to travel 210 km without stoppage = \(\frac{210}{90}\)
= \(\frac{21}{9}\) hours
Difference in time = 3 - \(\frac{21}{9}\)= \(\frac{2}{3}\) hour = 40 min
Total time of stoppage in 3 hours is 40 min .