fansofboys
28.09.2020 •
Mathematics
A motorboat heads upstream a certain distance and returns to its starting point. The trip up and back
takes 9 hours. The current is running at 5 miles per hour (mph). If the motorboat maintained a constant
speed of 10 mph relative to the water, what is the total distance of the trip?
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Ответ:
67.5 miles
Step-by-step explanation:
If x is the distance one way, then the time it takes when moving with the current is:
x = 15 t₁
The time it takes when moving against the current is:
x = 5 t₂
The total time is 9 hours:
t₁ + t₂ = 9
Substituting:
x/15 + x/5 = 9
4x/15 = 9
4x = 135
2x = 67.5
The total distance round trip is 67.5 miles.
Ответ:
4.91666666667
Step-by-step explanation:
this is what i got