Average speed

The average speed of a good cyclist is 30 km/h. The average speed of the less able is 20 km/h. They both set off on the same route at the same time. Good cyclist drove it 2 hours earlier. How long was the route?

Correct result:

s =  120 km

Solution:

v1=30 km/h v2=20 km/h    s=v1 (t2)=120 km s=v2 t s=30 (t2) s=20 t  s30t=60 s20t=0  s=120 t=6



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