A tap can empty a tank in 30 minutes. A second tap can empty it in 45 minutes. If both the taps operate simultaneously, how much time is needed to empty the tank?

Options

A. (a) 30min
B. (b) 18min
C. (c) 15min
D. (d) 14min

Answer

C

Explanation

दोनों नल को साथ खोलने पर टैंक खाली होने में लगा समय
` = (30 xx 45)/(30 + 45) = (30 xx 45)/(75) = 18 ` मिनट