At 1:00 pm, a truck left city P and headed toward City Q at a constant speed of 38 km/h. One hour later, a car left City Q and headed toward City P along the same road at a constant speed of 42 km/h. If the distance between City P and City Q is 378 km, at what time will the truck and the car meet each other?  Choose one
A) 5:30	B) 5:45	C) 6:00	D) 6:15	E) 6:30
At 2:00 pm, the truck and the car are 340 km apart.   The truck and the car complete a distance of 80 km each hour.   The time it takes to meet is   340/80= 
<gadget id="calculator">  340/80</gadget>
<output>17/4 = around 4.25</output>
4.25 hours.   They will meet at 6:15 pm.   The answer is 6:15.
<result>D</result>
At 1:00 pm, a truck left city P and headed toward City Q at a constant speed of 38 km/h. One hour later, a car left City Q and headed toward City P along the same road at a constant speed of 42 km/h. If the distance between City P and City Q is 378 km, at what time will the truck and the car meet each other?