The speed of the current is 7 mph. The boat travels three times slower against the current than with the current. What is the speed of the boat in still water?

Question

Plz answer as soon as possible!

Answer 1

3 (b - c) = b + c

3b - 3c = b + c ... 2b = 4c

Answer 2

let the speed of the boat be x mph
so going upstream the speed is x-7
going downstream the speed is x+7

let the distance be d
time to go upstream = d/(x-7)
time to go downstream = d/(x+7)

time going upstream is 3 times going downstream
3d/(x+7) = d/(x-7)
divide by d
3/(x+7) = 1/(x-7)
3x-21 = x+7
2x = 28
x = 14

speed of boat is 14 mph

Answer 3

let the speed of the boat be x mph
so going upstream the speed is x-7
going downstream the speed is x+7

let the distance be d
time to go upstream = d/(x-7)
time to go downstream = d/(x+7)

time going upstream is 3 times going downstream
3d/(x+7) = d/(x-7)
divide by d
3/(x+7) = 1/(x-7)
3x-21 = x+7
2x = 28
x = 14

speed of boat is 14 mph

Answer 4

14 mph, why? Because I said so

Answer 5

Wind