a man can row at 5 kmph in still water . if the velocity of current is 2 kmph and it takes him 1 hour to row to a place and come back , how far is the place ?
"explanation : speed in still water = 5 kmph speed of the current = 1 kmph speed downstream = ( 5 + 2 ) = 7 kmph speed upstream = ( 5 - 2 ) = 3 kmph let the required distance be x km total time taken = 1 hour â ‡ ’ x / 7 + x / 3 = 1 â ‡ ’ 3 x + 7 x = 21 â ‡ ’ 10 x = 21 â ‡ ’ x = 2.1 km answer : option a"
divide(multiply(subtract(5, 2), const_3), 5)