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7 Running at an average speed of 40 km/hr, a bus completes a journey in 4 1 by 2 hours.
How much time will the return journey take if the speed is increased to 45 km/hr?
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A bus takes 4.5 hours to complete a complete a journey at a speed of 40km/hr
So, in this case, We will find the distance first because the distance is constant.
distance=speed*time
distance=40*4.5
distance=180km
Now, we find the time to cover the distance at the speed of 45km/hr
time=distance/speed
time=180/45
time=4hrs
Therefore, The answer is 4hrs
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