Question

a boat can travel 4km upstream in 15min. if the ratio of the speed of the boat in still water to the speed of the streem is 9:5. how much time will the boat take to cover 28km downstream?
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Answer 1

Answer:

Step-by-step explanation:

Speed of downstream =distance /time

15+4=68/time

19=68/time

Time =3.5 hr ~4 hr (approx.)

Note : downstream =Speed of boat +Speed of current

Upstream =Speed of boat -speed of current