A man rows a boat at a speed of 5 km / hr in still water. Find 1the speed of a river if it takes him 1 hr to row a boat to a place 2.4 km away and return
KingOMac1:
describe the question about upstream and downstream
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Answer:
1 km/hr
Step-by-step explanation:
one side Distance = 5 km
Let say speed of river = x km/hr
Speed with Stream = 5 + x km /hr
Speed against stream = 5 - x km/hr
Total time taken = 1 hr
Total Time = (2.4)/(5+x) + (2.4)/(5-x) = 1
(2.4)(5-x + 5 + x) = (5+x)(5-x)
2.4 * 10 = 5^2 - x^2)
24 = 25 - x^2
x^2 = 1
x = 1 km/hr
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