Question

A petrol pump delivers $4\frac{2}{5}$ liters of petrol per minute. How many minutes will to fill a tank holds $16\frac{1}{4}$ liters?

• A. $4.45$ min
• B. $3.69$ min
• C. $3.25$ min
• D. $5.25$ min

Answer 1

The correct option is B $3.69$ min

$4\left(\frac{2}{5}\right)liters\to 1minor\left(\frac{22}{5}\right)liters\to 1minthen1liters\to \left(\frac{1}{\left(\frac{22}{5}\right)}\right)min\therefore 16\left(\frac{1}{4}\right)liters\to \left(\frac{5}{22}\right)\times \left(16\right(\frac{1}{4}\left)\right)min=\left(\frac{5}{22}\right)\times \left(\frac{65}{4}\right)=3.69min$