Question 901022
The trains are traveling toward each other, so it's a number line.
The earlier train (Train B) travels 1 hour and 10 minutes (or {{{1/6}}}hr) before the second train (Train A) leaves.
At 60kph, it has covered 70km by 2:45pm.
Now the trains are 510-70km, or 440km, apart.
If they are traveling 50+60kph (110kph), how long will it then take to travel 440km?  4 hours.
4 hours from Jalandhar at 50kph = 200km
At 6:45pm, the trains will meet -- Train A will be 200km from Jalandhar and Train B will be 310km from Jalandhar.<br>
Prove:
Train A travels 4 hours at 50kph, for a total of 200km
Train B travels 5{{{1/6}}} hours at 60kph, for a total of (5{{{1/6}}}*60) 310km
200 + 310 = 510km