arithmetic - two stations p and q are 175 km apart on a straight track one train starts from p at 7 am and travels towards q at 20 kmph another train starts from q at 8 am and travels towards p at a speed of 45 kmph at what time will they meet - skillgun

Assume both trains meet after x hours after 7 am
Distance covered by train starting from P in x hours = 20x km
Distance covered by train starting from Q in (x-1) hours = 45(x-1)
Total distance = 175
=> 20x + 45(x-1) = 175
=> 65x = 130
=> x= 2
Means, they meet after 3 hours after 7 am, ie, they meet at 9 am