One person travels from X to Y and then from Y to X. He takes differen

One person travels from X to Y and then from Y to X. He takes different routes back and forth. It took him 36 miles per hour to move from X to Y, and it took him 48 miles per hour to come from Y to X. What was the average speed of his entire travel? (1) The distance of the return trip was 24% (…)