A boat moves downstream at the rate of one km in 71/2 minutes and upstream at the rate of 5 km an hour. What is the velocity of current ?

A boat moves downstream at the rate of one km in 71/2 minutes and upst

1.	A boat moves downstream at the rate of one km in 71/2 minutes and upstream at the rate of 5 km an hour. What is the velocity of current ?
A.	1.3 km/hr
B.	1.2 km/hr
C.	1.6 km/hr
D.	1.5 km/hr
Answer» E.

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