Cyclists and walkers

A group of tourists started at 8:00 at speed 4 km/h walk. At half-past ten, another group started on a bike and caught up with a group of tourists at 10:50. What was the average speed of cyclists?

Correct result:

v2 =  8.5 km/h

Solution:

v1=4 km/h t3=10+50/60=65610.8333 h t1=t38.00=10.83338.00=1762.8333 h t2=t3(9+30/60)=10.8333(9+30/60)=431.3333 h  s1=s2 v1 t1=v2 t2  v2=v1 t1t2=4 2.83331.3333=172=172 km/h=8.5 km/h



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