a student travels from his house to school at 10 km / hr and reaches school 2 hours late . the next day he travels 15 km / hr and reaches school 1 hour early . what is the distance between his house and the school ?
"let x be the distance from his house to the school . x / 10 = x / 15 + 3 6 x = 4 x + 180 2 x = 180 x = 90 km the answer is d ."
multiply(multiply(10, 15), divide(subtract(15, 10), add(2, 2)))