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Cassius drives his boat upstream for 45 minutes. It takes him 30 minutes to return downstream. His speed going upstream is 3 miles per hour slower than his speed going downstream. Find his upstream and downstream speed

 Aug 27, 2020
 #1
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Upstream speed = 45 miles per hour, downstream speed = 60 miles per hour

 Aug 27, 2020
 #2
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Let his speed downstream =S
His speed upstream =S - 3
[S - 3] * 0.75 =S * 0.5, solve for S
0.75S - 2.25 =0.5S
- 2.25 =0.5S - 0.75S
- 2.25 = - 0.25S
S = - 2.25 / - 0.25
S = 9 mph - his speed downstream
9 - 3 = 6 mph - his speed upstream.

 Aug 27, 2020

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