Question

Four different candles, which can last for 5 hours, 4 hours, 3 hours, 2 hours of burning, respectively, are lit in a room at the same instant and allowed to burn till such time that the three candles in the room get extinguished. The cost of burning each one of these candles is 75 paise per hour. The cost involved is:

Answer 1

5+4+3+2+=14
14 into 75
= 1050

Answer 2

Answer:9.75 Rs

Step-by-step explanation:Candle with smallest burning time will ectinguish first so first 3 candle will extinguish after 4 hours.

Total time of burning of Candles= 2(extinguish)+3(extinguish)+4(extinguish)+4(will have 1 hr left)=13 hours

Cost per hour=Rs 0.75/hr

Totql=13*0.75=9.75Rs