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8 September, 05:14

Fran swims at a speed of 2.9 km/h in still water. The Lazy River flows at a speed of 0.1 km/h. How long will it take Fran to swim 9 km upstream?

It will take Fran h to swim 9 km upstream.

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  1. 8 September, 08:47
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    Fran's upstream speed (against the current):

    2.9 km/hr - 0.1 km/hr = 2.8 km/hr

    Fran's downstream speed (with the current):

    2.9 km/hr + 0.1 km/hr = 3.0 km/hr

    Using the distance formula for calculating time:

    rate x time = distance

    time = distance / rate

    Fran's upstream time = 9 / 2.8 = 3.21 hrs

    Fran's downstream time = 9 / 3.0 = 3.0 hrs
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