a man can row 8 kmph in still water . when the river is running at 1.2 kmph , it takes him 1 hour to row to a place and black . how far is the place ?
"m = 8 s = 1.2 ds = 8 + 1.2 = 9.2 us = 8 - 1.2 = 6.8 x / 9.2 + x / 6.8 = 1 x = 3.68 . answer : b"
multiply(divide(multiply(add(8, 1.2), subtract(8, 1.2)), add(add(8, 1.2), subtract(8, 1.2))), const_2)