SOLUTION: Mahmoud runs to a marker and back in 15 minutes. His speed on the way to the marker was 5m/s and his speed on the way back was 4m/s. Find the distance to the marker.

SOLUTION: Mahmoud runs to a marker and back in 15 minutes. His speed on the way to the marker was 5m/s and his speed on the way back was 4m/s. Find the distance to the marker.

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Question 511398: Mahmoud runs to a marker and back in 15 minutes. His speed on the way to the marker was 5m/s and his speed on the way back was 4m/s. Find the distance to the marker.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Avg speed = 2*5*4/(5+4) = 40/9 m/sec for the round trip.
2d = (40/9) m/sec * 15 min * 60 sec/min = 36000/9 meters = 4 km
d = 2 kilometers

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