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?

Correct result:

t =  2 h
s =  140 km

Solution:

t1=13060=1 60+3060=9060=32=1.5 h v1=40 km/h v2=70 km/h    s=v1 (t+t1) s=v2 t s=40 (t+1.5) s=70 t  s40t=60 s70t=0  s=140 t=2=2 h



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