The speed of boat in still water is 15km/hr if needs 4 more his to travel 63 km against the current of a river than it needs to travel down

Question

The speed of boat in still water is 15km/hr if needs 4 more his to travel 63 km against the current of a river than it needs to travel down the river determine the system of equation

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Khải Quang 2 weeks 2021-07-18T22:55:39+00:00 1 Answers 1 views 0

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    2021-07-18T22:57:16+00:00

    Answer:

    \frac{63}{15  - c} - \frac{63}{15  + c} = 4

    Step-by-step explanation:

    The systems of equations are

    Let us assume the rate of the current be c

    Now actual speed against the current is (15 – c)

    And, the actual speed with the current is (15 + c)

    Here we applied the time formula i.e. distance by speed

    Also the upstream time  – downstream time = 4

    Now the equations are

    \frac{63}{15  - c} - \frac{63}{15  + c} = 4

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