SSC JE Civil Engineering 2018 Set 2 Solved Paper

Effective working time = 7 hour s = 7 × 60= 420 minute.
Per batch time = 3 minute.
Number of mixing batch = 420/3 = 140.
Output concrete of per batch = 150 litre.
Output concrete of 140 batch = 140 × 150 = 21000 litre.
Assuming the efficiency = 90%.
Output concrete of 140 batch= 21000 × 0.9 = 18900 litres