There is a road beside a river.Two friends started from a place A, moved to a temple situated at another place B and then returned to A again. One of them moves on a cycle at a speed of 12 km/hr, while the other sails on a boat at a speed of 10 km/hr. If the river flows at the speed of 4 km/hr, which of the two friends will return to place A first ?  Choose the most appropriate option.
A) 5.4 km /hr	B) 7.2 km /hr	C) 8.4 km/hr	D) 9.6 km /hr	E) 4.6 km /hr
speed of cycle both side on road will be same   average speed of cycle = 12 kmhr   downstream , boat speed =10+4= 
<gadget id="calculator">10+4</gadget>
<output>14</output>
14kmhr   upstream= 10- 4= 
<gadget id="calculator">10- 4</gadget>
<output>6</output>
6kmhr   averge of boat speeds=( 2* 14* 6)/14+6=8.4 kmhr   ANSWER:8.4 km/hr
<result>C</result>
There is a road beside a river.Two friends started from a place A, moved to a temple situated at another place B and then returned to A again. One of them moves on a cycle at a speed of 12 km/hr, while the other sails on a boat at a speed of 10 km/hr. If the river flows at the speed of 4 km/hr, which of the two friends will return to place A first ?