Timetable 20313

The train ran the distance between stations at a speed of 90km/h in 4 hours. What speed can it take if, according to the new timetable, the journey takes an hour longer?

Correct answer:

v2 =  72 km/h

Step-by-step explanation:

v1=90 km/h t1=4 h  s=v1 t1=90 4=360 km  t2=t1+1=4+1=5 h  v2=s/t2=360/5=72 km/h

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