a man can row at 6 kmph in still water . if the velocity of current is 2 kmph and it takes him 2 hour to row to a place and come back , how far is the place ?
"speed in still water = 6 kmph speed of the current = 2 kmph speed downstream = ( 6 + 2 ) = 8 kmph speed upstream = ( 6 - 2 ) = 4 kmph let the required distance be x km total time taken = 2 hour x / 8 + x / 4 = 2 x + 2 x / 8 = 2 3 x / 8 = 2 3 x = 16 x = 5.33 km answer : a"
divide(multiply(subtract(6, 2), const_3), 6)