A motorboat has a four hour supply of gasoline. How far from the marina can it travel if the rate going out against the current is 20mi/h and the rate coming back with the current is 30 mi/h

The distance the marina can travel = = 48 miles

Step-by-step explanation:

The rate going out against the current is = u - v = 20

The rate going out with the current is = u + v = 30

Let the distance traveled by the motorboat =

Total time the boat can travel = 4 hours

⇒ Total time = ( Time taken by boat to go against the current ) + ( Time                                  taken by boat to go  with the current )

⇒ 4 =

⇒ 4 =

⇒ 4 =

⇒ = 48 miles

This is the distance the marina can travel.

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step-by-step explanation:

ever thing time 1 is a multiply by 1 it get