Two cyclists

Two cyclists started from crossing in the same time. One goes to the north speed 20 km/h, the second eastward at speed 26 km/h. What will be the direct distance cycling 30 minutes from the start?

Correct result:

s =  16.4012 km


A=90 t=30/60=12=0.5 a=20 t=20 0.5=10 b=26 t=26 0.5=13 s=a2+b2=102+132=269=16.4012 km

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