Please help me solve these two math questions. Thank you so much to those who helped!
1) An athletics track consists of 2 straight lengths of 100m and two semicircular arcs at either end of radius 31m. How many laps can Mo Farah run round the track if he runs for 43 minutes 13 seconds at 5.78m/s?
2) Jack and Jill went up the hill. They started at the same time, but Jack arrived at the top one-and-a-half hours before Jill. On the way down, Jill calculated that, if she had walked 50% faster an Jack had walked 50% slower, then they would have arrived at the top hill at the same time. How long did Jill actually take to walk up to the top of the hill?