a train travels 225 km in 3.5 hours and 370 km in 5 hours . find the average speed of train .
"as we know that speed = distance / time for average speed = total distance / total time taken thus , total distance = 225 + 370 = 595 km thus , total speed = 8.5 hrs or , average speed = 595 / 8.5 or , 70 kmph . answer : c"
divide(add(225, 370), add(3.5, 5))