speed of a boat in standing water is 11 kmph and speed of the stream is 2.5 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 = 8.5 kmph speed downstream = 13.5 kmph total time taken = 105 / 8.5 + 105 / 13.5 = 20.12 hours answer is b"
add(multiply(add(add(11, 2.5), subtract(11, 2.5)), 105), multiply(subtract(add(divide(105, add(11, 2.5)), divide(105, subtract(11, 2.5))), add(add(11, 2.5), subtract(11, 2.5))), const_60))