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A river 91.4 m wide flows toward the south at 33.6 m/min. A girl on the west bank wishes to reach the east bank in the least possible time. She can swim 91.4 m in still water in 2.00 min. (a) How long does it take her to cross the river

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lublana

Answer:

2.0 min

Explanation:

We are given that

Width of river,d=91.4 m

Time,t=2 min

Rate of flowing water of river=33.6/min

We have to find the time taken by girl to cross the river.

Speed of girl=[tex]v=\frac{distance}{time}=\frac{91.4}{2}=45.7m/min[/tex]

Time taken by girl=[tex]\frac{distance}{speed}[/tex]

Using the formula

Time taken by girl=[tex]\frac{91.4}{45.7}[/tex]

Time taken by girl=2.0 min

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