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. A good cyclist drove it 2 hours earlier. How long was the route?

Correct answer:

s =  120 km

Step-by-step explanation:

v1​=30 km/h v2​=20 km/h  s=v1​⋅ (t−2) s=v2​⋅ t s=30⋅ (t−2) s=20⋅ t  s−30t=−60 s−20t=0  Row2−Row1→Row2 s−30t=−60 10t=60  t=1060​=6 s=−60+30t=−60+30⋅ 6=120  s=120 t=6

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