Use reasoning to answer the following question.
Prejean's speed in a race was three-quarters that of Rickey. If they both took a total of 70 minutes to run the race, calculate the total number of minutes that Rickey took to finish the race.

40
Let's say Rickey took t minutes to finish the race.

If Prejean's speed in the race was three - quarters that of Rickey, and Rickey took t minutes to finish the race, the time that Prejean took to finish the race is 3 / 4 * t = 3 / 4t.

Together, Rickey and Prejean took t + 3 / 4t = 70.

They took 1 3 / 4 t hours = 70 to finish the race.

This is 7 / 4t = 70.

t = 70 * 4 / 7.

The time that Rickey took to finish the race is t = 40 minutes.

.

The answer is 40