P and Q working individually can finish a job in x and y days respectively. P starts the work and they both work on alternate days and the job is finished in 7 days. If Q starts the work and with P working on alternate days, the work gets over in 6 (3)/(4) days. Compare the efficiencies of P and Q.
1
P's efficiency =75% of Q's efficiency
2
Q's efficiency =75% of P's efficiency
3
P's efficiency ∶ Q's efficiency = 2 ∶ 3
4
P's efficiency =55% of Q's efficiency