Calculating average speed

Question

a cyclist travels 21 km during the first 3 hours, and then, travels 8 km during the next. What is the average speed?

Answer 1

To find the average you need to first find the total distance and total time for both legs.

The total distance is (21 + 8) km

The total time is (3 + 1) hours

So the average speed is total distance divided by the total time

(21 + 8)km / (3 +1)hrs = 29km / 4hrs = 7.25 kmph