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Two concrete mixers of capacity 200 liters each are used in a construction site to produce 20 cubic meter of concrete. Ingredient charging, mixing and discharge times are 3 minutes, 7 minutes and 1 minute respectively. Assuming a time loss of 5 minutes per hour of operation, the total time in hours for the mixers to produce the required amount of concrete will be ___________
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- 10
- 15
- 25
- 47
Correct Option: A
Capacity of the concrete mixers = 2 × 200 liters
| = 2 × |  |  | m3 = 0.4 m3 | |
| 1000 |
According to question, time taken to produce 0.4 m3 of concrete = 3 + 7 + 1 = 11 mins
| Time taken to produce 20 m3 of concrete = | | | × 11 mins = 550 mins | |
| 0.4 |
As tune loss of 5 min is in 1 hour
| For 550 mins, = | | | × 5 min = 50 mins | |
| 55 |
Total time required = 550 + 50 = 600 mins = 10 hours.
