Question
Two candles of the same height are lighted at the same
time. The first is consumed in 10 hours and the second in 8 hours. Assuming that each candle burns at a constant rate, in how many hours after being lighted, the ratio between first and second candles becomes 4:1.Solution
Let the candle height is 1 meter. Let the required time =‘t’ hours In 10 hours first candle lighted = 1 So in 1 hour first candle lighted = t/10 After ‘t’ hours remaining first candle = (1 - t/10) Similarly, After ‘t’ hours remaining second candle = (1 - t/8) So the ratio between the first and second candle after being lighting = ((1 - t/10))/((1 - t/8)) = 4/1 1 - t/10 = 4 - (4t)/8 t/2 - t/10 = 4 – 1 (5t - t)/10 = 3 T = 15/2 hours or 7 hours 30 minutes
India won the ICC Men Cricket World Cup for the first time in which of the following years?
Which is the longest river in the world?
What is the full form of ONDC?
Which of the following bank has become the first public sector bank to go live on Income Tax Department's new Direct Tax Collection System Tin 2.0?
Which of the following rivers does NOT have its origin in the Indian state of Rajasthan?
The scientific study of rocks is called as
Which writ is issued when the court finds that there is unlawful arrest of a person?
In which state of India is the Gol Gumbaz situated?
The UN agency for international education cooperation is:
According to RBI's Annual Report 2023, what was the growth rate of Gross Fixed Capital Formation (GFCF) in India during the fiscal year 2022-23?
Relevant for Exams:
