A train from a to B, 6 hours, 3 / 5 of the whole journey, just the remaining 300 kilometers, the rest of the journey to finish how many hours?

A train from a to B, 6 hours, 3 / 5 of the whole journey, just the remaining 300 kilometers, the rest of the journey to finish how many hours?

If we don't consider the accelerated start of the train, that is to say, it takes four hours to keep moving at a constant speed all the time. 1-3 / 5 = 2 / 5, 300 divided by 2 / 5 = 750 is the whole process, 750-300 = 450, 450 divided by 6 is the speed 75, 300 divided by 75 = 4 hours

A car from a to B, the first two hours a total of 17% of the total line of 6, the third hour driving the remaining 5% of the road 11, 3 hours later, there is still a full line
What's the percentage of (above)?

1-（6/17）-[1-（6/17）]×（5/11）=6/17

A car has traveled 7 / 20 of the whole journey from place a to place B. the rest of the journey is 75KM more than the one already traveled. How many km is the distance between a and B

If the total length of 250km is x, then the remaining distance is 13X out of 20 minus 7x out of 20, 6x out of 20 = 75KM, so the total length of 250km is right. Praise it