Question

a vehicle uses 2one by 5 litres of petrol in 1 hour . how many litres of petrol will be required to run the vehicle for 3 one by 2 hours?

Answer 1

$1hr = 2 \frac{1}{5} \\ \\ 1hr = \frac{11}{5}$

$3 \frac{1}{2} hr = \frac{7}{2} \times \frac{11}{5}$

$= \frac{77}{10}$

7.7 litres of petrol !!