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Ratio of efficiency of P and Q = 4:3 Let the efficiency of P and Q be 4x and 3x units per day respectively. Total work = 7x × 32 = 224x units Required time = (0.75 × 224x)/3x = 56 days
A train 450 metres long is running at a speed of 54 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is: