A boat covers 20 km upstream and 40 km downstream distance in 4 hours, while it covers 70 km upstream and 60 km downstream distance in 10 hours. What is the speed (in km/hr) of the current?

A boat covers 20 km upstream and 40 km downstream distance in 4 hours,

1.	A boat covers 20 km upstream and 40 km downstream distance in 4 hours, while it covers 70 km upstream and 60 km downstream distance in 10 hours. What is the speed (in km/hr) of the current?
A.	10
B.	15
C.	5
D.	12.5
Answer» D. 12.5

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A boat covers 20 km upstream and 40 km downstream distance in 4 hours, while it covers 70 km upstream and 60 km downstream distance in 10 hours. What is the speed (in km/hr) of the current?

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