A boatman trying to cross the river.the width of the river is 400m.he is selling boat with 10m/sec.he takes 50sec to cross the river due to flow of water.calculate the drift. Choose the correct choice from the following.
A) 500	B) 400	C) 300	D) 200	E) 100
the distance boatman travel to cross the river=50*10= 
<gadget id="calculator">50*10</gadget>
<output>500</output>
500m   he sell the boat diagonally.so height=400m,base be x and hypotenuse =500m   so by Pythagoras theorem, square of 400+ square of x=square of 500   so,square of x = 250000-160000   x=âˆš250000-160000,x=âˆš90000=300   drift =300m   answer 300
<result>C</result>
A boatman trying to cross the river.the width of the river is 400m.he is selling boat with 10m/sec.he takes 50sec to cross the river due to flow of water.calculate the drift.