A truck with a speed of 40 km / h drove away from the gas station. After some time, a bus followed him, whose speed was 20 km / h more than the speed of the truck. 2 hours after the bus left the gas station, he caught up with the truck. Find the time the bus lingered at the gas station after the truck left
1) 20 km / h – speed difference or approach speed
2) 20 ◦ 2 = 40 (km) – was between the truck and the bus initially
3) 40: 40 = 1 (h) – the truck drove to the exit of the bus
Answer: for 1 hour
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