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=12 minv_{1}=5 \ \text{km/h} \ \\ v_{2}=100 \ \text{km/h} \ \\ t_{1}=4 \ \text{h} \ \\ s=v_{1} \cdot \ t_{1}=5 \cdot \ 4=20 \ \text{km} \ \\ t_{3}=s/v_{2}=20/100=\dfrac{ 1 }{ 5 }=0.2 \ \text{h} \ \\ t_{2}=t_{3} \cdot \ 60=0.2 \cdot \ 60=12 \ \text{min}

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