At 1:00 pm, a truck left city P and headed toward City Q at a constant speed of 35 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 335 km, at what time will the truck and the car meet each other?
Options:
A) 5:00
B) 5:30
C) 6:00
D) 6:30
E) 7:00
At 2:00 pm, the truck and the car are 300 km apart.   The truck and the car complete a distance of 75 km each hour.   The time it takes to meet is   300/75= 
<gadget id="calculator">  300/75</gadget>
<output>4</output>
4 hours.   They will meet at 6:00 pm.   The answer is 6:00.
<result>C</result>
At 1:00 pm, a truck left city P and headed toward City Q at a constant speed of 35 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 335 km, at what time will the truck and the car meet each other?