x and y are two towns . ganesh covers the distance from x to y at an average speed of 54 km / hr . however , he covers the distance from y to x at an average speed of 36 km / hr . his average speed during the whole journey in km / hr . is :
"solution : average speed = 2 xy / x + y = 2 * 54 * 36 / 54 + 36 = 43.2 answer : b"
divide(add(add(subtract(54, const_10), const_100), add(subtract(54, const_10), const_100)), add(divide(add(subtract(54, const_10), const_100), 54), divide(add(subtract(54, const_10), const_100), 36)))