Question

A car travels 60 km in 1hr 30 min.How long will it take to cover a distance of 100 km at the same speed.

Answer 1

time taken to cover 60 km=1 hr 30 min=90min

time taken to cover 1 km=90/60=3/2 min

time taken to cover 100 km=3/2×100=150 min

Therefore, time taken to cover 100 km=150 min or 2 hr 30 min

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Answer 2

distance covered by car = 60 km = 60,000m
time taken = 90min
speed = 60,000/90 = 6000/18
speed = 2000/3 m/ min

now distance = 100km = 100,000m
time = distance /speed

= 100,000/(2000/3 ) = (100,000*3 )/ 2000
= 300/2 = 150 min
hope you understand

hope you understand.