If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer (in litres) of 150-liter capacity is
No. of batches = $$7\times\frac{60}{3}=140$$
Capacity of mixer = 150 liter
Real case scenario output is only 90% of 150 = 135 liter
Thus, total output = $$140\times135=18900$$
=> Ans - (D)
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