The hourly rate in miles is our speed. And the equation used to calculate speed is Distance/Time. So: 0.5/0.25 = 2miles/per hour.
Thr probability is calculated from the data gathered from tests on a large number of people. There's undoubtedly some data included with this question that you neglected to copy. Without it, it's not possible to come up with an answer.
Answer:
the answer for this problem is 135
