Forty-five 81599

Lukas left the Tereza cottage and walked at an average 4 km/h speed. Forty-five minutes later, Jakub followed him on a bicycle from the same cottage. He followed Lukas's route and caught up with him after 20 minutes. What was Jakub's average speed?

Correct answer:

v2 =  13 km/h

Step-by-step explanation:

v1=4 km/h t1=45 min h=45:60  h=0.75 h t2=20 min h=20:60  h=0.33333 h  s1=v1 (t1+t2)=4 (0.75+0.3333)=3134.3333 km s1=s2 s1=s2 = v2 t2  v2=t2s1=0.33334.3333=13 km/h



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