| [ A ] 4.5 seconds |
|
| [ B ] 5.5 seconds | |
| [ C ] 6.5 seconds | |
| [ D ] 7.5 seconds |  |
| [ A ] 4.5 seconds |
|
| [ B ] 5.5 seconds | |
| [ C ] 6.5 seconds | |
| [ D ] 7.5 seconds | |
| Answer : Option D |
| Explanation : |
| time = $160 + 140 \over 77 \times {5 \over 18} + 67 \times {5 \over 18 }$ = $300 \over {5 \over 18} \times 144 $ = $300 \over 40$ = 7.5 seconds |
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