At 1:00 pm, a truck left city P and headed toward City Q at a constant speed of 50 km/h. One hour later, a car left City Q and headed toward City P along the same road at a constant speed of 40 km/h. If the distance between City P and City Q is 230 km, at what time will the truck and the car meet each other?  Choose the correct choice from the following answers
A) 4:00 B) 4:30 C) 5:00 D) 5:30 E) 6:00
At 2:00 pm, the truck and the car are 180 km apart.   The truck and the car complete a distance of 90 km each hour.   The time it takes to meet is   180/90= 
<gadget id="calculator">  180/90</gadget>
<output>2</output>
2 hours.   They will meet at 4:00 pm.   The answer is 4:00.
<result>A</result>
At 1:00 pm, a truck left city P and headed toward City Q at a constant speed of 50 km/h. One hour later, a car left City Q and headed toward City P along the same road at a constant speed of 40 km/h. If the distance between City P and City Q is 230 km, at what time will the truck and the car meet each other?