A boat moves downstream at the rate of 1 km in 5 mins & upstream at the rate of 4 km/hour. What is the velocity of the current?	Choose the correct option.
A) 2 km/hr
B) 4 km/hr
C) 8 km/hr
D) 10 km/hr
E) 12 km/hr
Speed downstream = 1(560)=12 km/hr   Speed upstream =41 = 4 km/hr   velocity of the current =12(12−4)=4 km/hr   4 km/hr
<result>B</result>
A boat moves downstream at the rate of 1 km in 5 mins & upstream at the rate of 4 km/hour. What is the velocity of the current?