Warehouse cars

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

Correct answer:

t =  2 h
s =  140 km

Step-by-step explanation:

t1=16030=1+6030=601 60+30=6060+30=6090=23=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  Row2Row1Row2 s40t=60 30t=60  t=3060=2 s=60+40t=60+40 2=140  s=140 t=2=2 h

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