speed of a boat in standing water is 8 kmph and the speed of the stream is 6 kmph . a man rows to place at a distance of 210 km and comes back to the starting point . the total time taken by him is :
"sol . speed upstream = 2 kmph ; speed downstream = 14 kmph . ∴ total time taken = [ 210 / 2 + 210 / 2 ] hours = 120 hours . answer a"
add(divide(210, add(8, 6)), divide(210, subtract(8, 6)))