A boat can go 5 km upstream and 7 km downstream in 45 minutes. It can also go 5 km downstream and 2.5 km upstream in 25 …
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A boat can go 5 km upstream and 7 km downstream in 45 minutes. It can also go 5 km downstream and 2.5 km upstream in 25 minutes. How much time (in minutes) will it take to go 6 km downstream?
✓ Correct answer: b) 12
ExplanationA boat can go 5 km upstream and downstream in 45 minutes.It can also go 5 km downstream and 2.5 km upstream in 25 minutes.Speed of boat during downstream = D km/hr Speed of boat during upstream = U km/hr According to the question, …………..(1) …………..(2) Multiply by 2 both sides ………….(3) Subtract (1) from (3) Speed of boat during downstream = 30 km/hr Time required to go 6 km downstream = Hence, Option B is the correct answer.
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