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Running at an average speed of 40 km/hr, a bus completes a journey in 4(1/2)
How much time will the return journey take if the speed is increased to 45 km/hr
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ANSWER = 4 hr
A bus completes a journey in 4 and half hours at an average speed of 40 km/h
Time taken by the bus to complete journey at 45 km/hr
speed = 40 km/hr
= 40 × 5 / 18
= 11.1 m/s
time = 4.5 hour
= 4.5 × 360
= 1620 s
distance = speed × time
= 11.1 × 1620
= 17982 m
now speed = 45 km/h
= 12.5 m/s
time = distance / speed
= 17982 / 12.5
= 1438 . 56 s
= 3.99 hr ≈ 4 hr
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