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A boat can go 20 km downstream and 30 km upstream in 2 hours 20 minutes. Also, it can go 10 km downstream and 8 km upstream in 49 minutes. What is the speed of boat downstream in km/h?
18
20
16
24
Correct option:4
Solution: According to the given statement
20/ds +30/us=2 hr 20 min=7/3
20/ds +30/us=7/3-------------(1)
10/ds+8/us=49/60------------(2) x 2
20/ds+16/us=49/30-----------(3)
Subtract eq(3) from eq(1)
14/us=21/30 => us=20
Ds= 24 km/h
Hence correct answer is 24 km/h
By: santosh ProfileResourcesReport error
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