Question 817878
L = 684 miles
w = 1197 miles
L + w = 1881 miles
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time:
tw = tL + 3
tw + tL = 39
tL + 3 + tL = 39
2tL = 36
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tL = 18 hours
tw = 21 hours
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speeds:
trip average speed:
s = d / t
s = 1881 / 39
s = 48.230769 mph
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land and water speeds:
sL = 684 / 18
sL = 38 mph
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sw = 1197 / 21
sw = 57 mph
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speed difference:
sw - sL = 19 mph
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