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At 8:00 a.m., my son rode a bicycle at a speed of 18 km/h. at 8:20 a.m., his father followed him at a speed of 60 km/h. How long will it take for Dad to arrive?

Correct answer:

t =  8.6 min

Step-by-step explanation:

v1=18 km/h v2=60 km/h  T = 8:20  8:00 T=20 min h=20:60  h=0.33333 h  s1=s2  v1 (x+T)=v2 x 18 (x+0.33333333333333)=60 x  42x=6  x=426=0.14285714  x=710.142857  t=x min=x 60  min=0.1429 60  min=8.6 min=8.6 min

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