There, shouldn't the speed ratio of P: Q be 4:5? But it's 5:4 as per the answer key. Can anyone please explain how?
2 Answers
no · 2026-11-13 · 2 helpful
the formula i followed is speed of p/speed of q = underoot time taken by q/time taken by p. since its vice-versa it becomes 25/16 underoot, hence 5/4. you might have forgotten to switch the formula on either sides.
PRIYANSHIII · 2026-11-13 · 1 helpful
The correct ratio is P : Q = 5 : 4. Using the given information: - P's speed = 40 m/min - P takes 16 minutes after crossing. - Q takes 25 minutes after crossing. Since the distances before and after crossing are swapped: 40 x 16 = Q x 20 So Q's speed = 32 m/min. Therefore: P:Q = 40:32 = 5 :4