Practicing Success
If pipe A can fill 350 litres in 3\(\frac{1}{2}\) min. Pipe B can fill 780 litres in 8\(\frac{2}{3}\) min. Find the time taken by both of them to fill 1615 litres. |
5 min 8\(\frac{1}{2}\) min 8\(\frac{2}{5}\) min 7\(\frac{1}{5}\) min |
8\(\frac{1}{2}\) min |
Time Amount (ltr) A → 3\(\frac{1}{2}\) min → 350 1 min → 100 B → 8\(\frac{2}{3}\) min → 780 1 min → 90
⇒ Efficiency of A → 100 l/min ⇒ Efficiency of B → 90 l/min ⇒ Eff. of A + B = 190 l/min Time taken by A and B both = \(\frac{Total\;amount\;to\;be\;filled}{combined\;efficiency}\) = \(\frac{1615}{190}\) = 8.5 min or 8\(\frac{1}{2}\) min |