Warehouse cars

From the warehouse started truck at speed 40km/h. After 1hour 30mins started from the same place same direction a car at speed 70 km/h. For how long and at what distance from the warehouse overtake a truck?

Result

t =  2 h
s =  140 km

Solution:


s = 40 (t+1.5)
40(t+1.5) = 70t

s-40t = 60
30t = 60

s = 140
t = 2

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