Answer:
It took Marcus 780 seconds or 13 minutes to wash his car.
Step-by-step explanation:
A quarter = 0.25
Solve the number of quarters in 3.25:
3.25 ÷ 0.25 = 13 quarter
On quarter = 60-second wash or 1 minute
13 quarters × 60 seconds/1 quarter = 780 seconds or 13 minutes.