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Question
If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of concrete mixer (in liters) of 150-liter capacity is
A.
15900
B.
16900
C.
17900
D.
18900
Answer ( Option D)

18900

Solution

Total number of batch = (7×60)/3 = 140

Output of concrete mixer = Discharge per batch × No. of batch

= 150 × 140 = 21000 liters

But the mixer discharges 90% of its capacity, hence practical output of concrete mixer = 0.9 × 21000 = 18900 litre

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