There are two bridges running parallel over river Kauvery, and they are 1 KM apart. A man started rowing the boat upstream under first bridge, his hat fell into river while he was exactly under second bridge. He realized that after 15 mts, and started rowing in opposite direction, he eventually caught his hat under First Bridge. What is the speed of river Kauvery?	Choose the correct choice from the following options
A) 5km/h	B) 4km/h	C) 3km/h	D) 1km/h	E) 2km/h
Let the upstream velocity=xkm/h   so he goes first 1 km then 15 min with this velocity   so total goes=x*15/60+1 km=x+4/4 km   and now he in downstream cover this distance in 15 min   so his downstream velocity=x+4/4*15=x+4/60   now speed of river=1/2[downstream speed-upstream speed]   =1/2[x+4/60-x/60]km/min   =2km/h   ANSW2km/hR:2km/h
<result>E</result>
There are two bridges running parallel over river Kauvery, and they are 1 KM apart. A man started rowing the boat upstream under first bridge, his hat fell into river while he was exactly under second bridge. He realized that after 15 mts, and started rowing in opposite direction, he eventually caught his hat under First Bridge. What is the speed of river Kauvery?