on a trip covering 350 km , a bicyclist travels the first 200 km at 20 km per hour and the remainder of the distance at 15 km per hour . what is the average speed , in km per hour , for the entire trip ?
"time 1 = 200 / 20 = 10 hours time 2 = 150 / 15 = 10 hours total time = 20 hours average speed = 350 / 20 = 17.5 km / hr the answer is c ."
speed(350, add(divide(200, 20), divide(subtract(350, 200), 15)))