A boatman can row 3 km against the stream in 30 minutes and return in 18 minutes. Find the rate of current ?	Options.
A) 2 kmph	B) 8/2 kmph	C) 5/2 kmph	D) 1/2 kmph	E) 2/2 kmph
Explanation:   Speed in upstream = Distance / Time = 3 x 60/30 = 6 km/hr.   Speed in downstream = 3 x 60/18 = 10 km/hr   Rate of current = (10-6)/2= 
<gadget id="calculator">(10-6)/2</gadget>
<output>2</output>
2 km/hr.   2 kmphnswer: 2 kmph
<result>A</result>
A boatman can row 3 km against the stream in 30 minutes and return in 18 minutes. Find the rate of current ?