Question 829657
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s = d/t
t = d/s
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out:
t1 = D/20
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return:
t2 = D/12
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round-trip time:
t1 + t2 = 5
D/20 + D/12 = 5
12D/12*20 + 20D/12*20 = 5
12D + 20D = 5*12*20
32D = 5*12*20
D = 5*12*20/32
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answer:
D = 37.5 miles
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