if a person walks at 15 km / hr instead of 9 km / hr , he would have walked 20 km more . the time traveled by him is ?
"let the actual distance traveled be x km . then , x / 9 = ( x + 20 ) / 15 5 x - 3 x = 60 = > x = 30 km . travel time is = 30 / 9 hours = 10 / 3 hours answer : c"
multiply(9, divide(20, subtract(15, 9)))