Question

A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What was the average speed of the runner in m/s?

Answer 1

Average speed = distance/time
Converting hrs to mins
= 2hrs =60+60=120mins
=120+57=177 mins
Average speed = 42/177
= 4.214285714285714

Answer 2

The average speed of the runner is 3.95 m/s.

Explanation:

Given that,

The distance covered by the runner, d = 42 km

Time, t = 2 hours 57 min = 2h + 0.95 h = 2.95 hours

It is required to find the average speed of the runner. Speed is given by :

$v=\dfrac{42\ km}{2.95\ h}\\\\v=14.23\ km/h$

or

v = 3.95 m/s

So, the average speed of the runner is 3.95 m/s.

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