How long does it take Ilya to cover the distance? Now find Ilya's average speed. Express Ilya's average speed numerically, in miles per hour.

Question

Ilya and Anya each can run at a speed of 8.30 mph and walk at a speed of 3.20 mph. They set off together on a route of length 5.00 miles. Anya walks half of the distance and runs the other half distance, while Ilya walks half of the time and runs the other half of the time.

Answer 1

For Ilya: 3.20·t/2 + 8.30·t/2 = 5.00; t = 10.00/(3.20 + 8.30) h = 0.87 h;

v_{av = 5.00/0.87 m/h = 5.75 m/h}