When a man drives his car from town A to town B he drives at 72mph downhill and at 56mph uphill.
Using the times taken for both legs of the journey, when he returned home he was able to calculate the distance between the two towns.

Originally posted by THUDandBLUNDER When a man drives his car from town A to town B he drives at 72mph downhill and at 56mph uphill.
Using the times taken for both legs of the journey, when he returned home he was able to calculate the distance between the two towns.

By on the flat do you mean flat out as in 'full whack'? Must be 72mph in that case if that's what he is doing downhill.
Otherwise i think this question is very ambiguous and there is not enough information to find out half the answer.

Originally posted by jimslyp69 By on the flat do you mean flat out as in 'full whack'? Must be 72mph in that case if that's what he is doing downhill.
Otherwise i think this question is very ambiguous and there is not enough information to find out half the answer.

Very ambiguous? Thank you very much!

I mean that there are three types of road: uphill, downhill, and flat.
Bu it is unknown how much of each there is.

Originally posted by Bowmann What if it were 0mph?

It still wouldn't matter. As long as his speed is the same on the flat in both directions, the time spent on the flat is equal both coming and going and can be subtracted out of the total time for his calculating purposes.

If the speed on the flat is 0, then for him to have made the trip (as stated in the original problem), there would have to be no flat stretches in his journey.

Originally posted by TDR1 if he isnt moving how can he reach his destination?? explain that please.

There's no explaination. He's just being stupid as usual.

I apoligise if you were being serious, but I don't see any way that could be true. If he were to ever reach his destination, his speed on the flat couldn't be zero unless there was no flats. And no, he wouldn't get there eventually traveling at speed zero.

Originally posted by The Plumber As long as his speed is the same on the flat in both directions, the time spent on the flat is equal both coming and going and can be subtracted out of the total time for his calculating purposes.

The times spent going uphill, downhill, and flat are non-zero but unknown.
We know only the uphill speed, downhill speed, and total time for each whole trip.

Originally posted by THUDandBLUNDER The times spent going uphill, downhill, and flat are non-zero but unknown.
We know only the uphill speed, downhill speed, and total time for each whole trip.

Actually, we only know two of the three.

We know only the uphill speed, downhill speed, and total time for each whole trip.