Train and walker

Walker passes an hour 5 km. Express train per hour 100 km. Walker went 4 hours. How many minutes took the distance express train?

Correct result:

t2 =  12 min

Solution:

v1=5 km/h v2=100 km/h t1=4 h s=v1⋅ t1=5⋅ 4=20 km t3=s/v2=20/100=15=0.2 h t2=t3⋅ 60=0.2⋅ 60 min=12 min

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