In 1 km race, P beats Q by 72 m in 12 s. Find the P's time over the course.

According to the formula,
Time taken by the winner/Distance covered by the loser = Difference of winning time/ Difference of winning distance
⇒ Time taken by P//(1000 - 72) = 12/72
∴ Time taken by P = (12/72) x 928
= 464/3 = 154²/₃ s