It would have taken 36 s for John to cover the distance.
Average speed is defined as the total distance travelled divided by the total time taken.
To obtain the answer to the question, we'll begin by calculating the time taken to cover the distance (3150 m) in each case.
Average speed = 350 m/min
Total Distance = 3150 m
Average speed = Total distance / total time
350 = 3150 / Time 1
Cross multiply
350 × Time 1 = 3150
Divide both side by 350
Time 1 = 3150 / 350
Time 1 = 9 mins
Multiply by 60 to express in seconds
Time 1 = 9 × 60
Average speed = 375 m/min
Total Distance = 3150 m
Average speed = Total distance / total time
375 = 3150 / Time 2
Cross multiply
375 × Time 2 = 3150
Divide both side by 375
Time 2 = 3150 / 375
Time 2 = 8.4 mins
Multiply by 60 to express in seconds
Time 2 = 8.4 × 60
Finally, we shall determine how much sooner it would have taken John to travel at 375 m/min. This can be obtained as follow:
Time 1 = 540 s
Time 2 = 504 s
Difference = Time 1 – Time 2
Difference in time = 540 – 504
Therefore, it would have taken John 36 s if he had travelled at an average speed of 375 m/min.
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