The world record for the men’s marathon, 42 km, is 2 hours and 3 minutes.

average speed: 20.5km/h

Explanation:

The following question is missing:

What was the average speed of the record-setting runner in km/h?

To answer this, first convert 3 minutes into hours. We know that 60 minutes make an hour, using this conversion factor we get:

3 minutes * (1 hour/60 minutes) = 0.05 hours

Next add this result to the 2 hours:

2 hours and 3 minutes = 2 h + 0.05 h = 2.05 hours

The average speed is obtained dividing the distance traveled by the time elapsed:

42 km/2.05 hours ≈ 20.5km/h

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dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.