SOLUTION: using the butterfly stroke to swim the length of the pool, Eva averaged 1.5 m/s. Swimming back, she used the breast stroke and averages 1.2 m/s. The entire swim took 1 min. and 15

Question 669767: using the butterfly stroke to swim the length of the pool, Eva averaged 1.5 m/s. Swimming back, she used the breast stroke and averages 1.2 m/s. The entire swim took 1 min. and 15 sec. How long was the pool?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
using the butterfly stroke to swim the length of the pool, Eva averaged 1.5 m/s. Swimming back, she used the breast stroke and averages 1.2 m/s. The entire swim took 1 min. and 15 sec. How long was the pool?
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The average speed of the round trip = 2*1.5*1.2/(1.5+1.2) = 3.6/2.7
= 4/3 m/sec
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1:15 = 75 seconds
Round trip distance = r*t = (4/3)*75 = 100 meters
One way = 50 meters

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