Question

At 2:30 p.m., Cayson leaves his house and drives north to the stadium. He arrives at

5:00 p.m. Also leaving at 2:30 p.m., his brother Riley leaves his house and drives south
to a lake. He arrives at 5:30 p.m. The driving distance from the stadium to the lake is 385
mi. Cayson and Riley drove at the same speed.
What was their speed?

Answer 1

It takes Cayson 2.5 hours to get from house to the stadium and it takes Riley 3 hours to get from house to the lake. In total they spent 5.5 hours to overcome the distance 385 mi.

Use formula:

`D=rt,` where D is distance, r - speed and t - time.

Thus,

`385=r\cdot 5.5,\\ \\r=70` mi/h.

Answer: 70 mi/h.