Question

If Ying Zyiyu covers the first 200 miles of a trip going 50mph. and the last hundred going 40mph, what was his average speed for the entire trip?

Answer 1

so, the first 200 miles were done at 50mph, how long did it take? well, 200/50, or 4hours

the last 100 miles were done at 40mph, how long did that take? well, 100/40, or 2 hours and a half.

so.. Ying covered 300 miles in 4+2.5 hours or 300/6.5 is his average speed.

Answer 2

46.15

Explanation:

I do RSM :)