speed of a boat in standing water is 9 kmph and speed of the stream is 1.5 kmph . a man can rows to a place at a distance of 105 km and comes back to the starting point . the total time taken by him is ?
"speed upstream = 7.5 kmph speed downstream = 10.5 kmph total time taken = 105 / 7.5 + 105 / 10.5 = 24 hours answer is b"
add(multiply(add(add(9, 1.5), subtract(9, 1.5)), 105), multiply(subtract(add(divide(105, add(9, 1.5)), divide(105, subtract(9, 1.5))), add(add(9, 1.5), subtract(9, 1.5))), const_60))