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Two piers, A and B, are located s km away from each other along a river. A motor boat, with a speed of vkm/hour in still water, is cruising between the two piers. How much time t (in hours) will the motorboat need to get from pier A to pier B and back, if the speed of the current is 5km/hour? Find t if: s=105, v=40

Respuesta :

speed in still water is v=40
speed of current is 5km/h
upstream speed: v-5=35
downstream speed: v+5=45
upstream time: 105/35=3
downstream time: 105/45=[tex] 2\frac{1}{3} [/tex]
total time: 3+[tex] 2\frac{1}{3} [/tex]=[tex] 5\frac{1}{3} [/tex]=5 hours 20 minutes
nrajpal

Answer:

25/6 hr

Step-by-step explanation:

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