Average Speed III

Question

 A bicyclist travels the first 700 m of a trip at an average speed of 8 m/s, travels the next 600 m in 90 s and the last 50s at a speed of 21 m/s. Find the average speed of the bicyclist for this trip.

Answer 1

700m at 8m/s implies 87.5s

600m in 90s

50s at 21m/s implies 1050m (you did mean 50s and not 50m ?)

700+600+1050=2350m

87.5s+90s+50s=227.5s

2350m/227.5s≈10.3296m/s