Traveling 27833

The truck drove at an average speed of 20 km/h and left Prague toward Liberec. At the same time, a bus left with him, traveling at an average speed of 30 km/h, and it arrived in Liberec 2 hours earlier than the truck. What is the distance between Prague and Liberec?

Correct answer:

s =  120 km

Step-by-step explanation:

v1=20 km/h v2=30 km/h T=2 h  s=v1 t s=v2 (tT) s=20 t s=30 (t2)  s20t=0 s30t=60  Row2Row1Row2 s20t=0 10t=60  t=1060=6 s=0+20t=0+20 6=120  s=120 t=6

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