The boat passed the distance between the two marinas for 8 hours against the current.

| January 11, 2021 | education

The boat passed the distance between the two marinas for 8 hours against the current. How long will it take for the return trip if the speed of the boat is 35 kph and the current speed is 5 km / h?

To begin with, we find out what the speed of the boat is equal to against the stream of the river, if it is known that the speed of the current is 5 km / h:
35 – 5 = 30
Now let’s determine how far the boat traveled against the river flow, if, according to the condition of the problem, it is said that it spent 8 hours on the whole journey:
S = V * T, where V is speed, T is time.
S = 30 * 8 = 240 km.
Next, we find the speed of the boat along the river:
35 + 5 = 40 km / h.
It remains to find how long the boat will cover the distance along the river:
S = V * T, where V is speed, T is time.
T = S / V = 240/40 = 6
Answer: the boat will sail the way back in 6 hours.



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