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bonufazy [111]
3 years ago
5

a boat can travel 30 miles upstream in the same amount of time you can travel 50 miles Downstream. If the speed of the current i

s 4 miles per hour, find the speed of the boat in still water.
Mathematics
2 answers:
almond37 [142]3 years ago
7 0
Speed, S = Distance (d) / Time (t) => S= d/t => t= d/S

Let the speed of boat in still water be x mph

Resulting speed upstream = x-4 mph for a distance of 30 miles
Resulting speed downstream = x-4 mph for a distance of 50 miles

Time taken in both distances is equal.
Therefore,

30/(x-4) = 50/(x+4) => 30(x+4) = 50(x-4) => 30x+120 = 50x-200 => 120+200 = (50-30)x => 20x = 320 => x=320/20 = 16 mph

The speed of boat in still water is 16 mph.


MA_775_DIABLO [31]3 years ago
6 0
The correct answer is 16mph.
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3 years ago
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Semmy [17]

Answer:

B. 70

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