A lamp lighter has to light 100 gas lamps. He takes one and half minutes to go from one lamp post to the next. Each lamp burns 10 cubic feet of gas per hour. How many cubic feet of gas has been burnt by 8.30pm, if he lights the first/last lamp at 6pm

Each lamp burns 10 cubic ft. of gas/hr.

Number of hours from 6 p.m. to 8:30 = 2.5 hrs = 150 minutes

He takes 1.5 minutes to go from one lamp to another.

So, 1st lamp will burn for 150 minutes

2nd lamp will burn for (150 – 1.5) min = 148.5 

3rd lamp will burn for (148.5 – 1.5) min = 147

= 1262.5 cubic feet

  • 6

is the answer 3737.5?

  • -1

syr 1262.5?

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