Question 1039180
Let r be the rate of the freight train. The passenger train goes r+15. So:
245/r+15=200/r
245r=200r+3000
45r=3000
r=66-2/3
r+15=81-2/3!!!!!!!!!!!!!!!!!!

245/r is 245 divided by r, which represents the time taken by the freight train......
Cross-multiplying 245/(r+15)=200/r, we get:
245r=200(r+15)
245r=200r+3000
etc..........