9.A car takes 2 hours to reach a destination by traveling at a speed of 60 km/h. How long will it take when the car travels at the speed of 80 km/h?
So, we have:∴$$x_1y_1 = x_2y_2$$
$$\Rightarrow 60 \times 2 = 80 \times x$$
$$\Rightarrow x = \frac { 3 }{ 2 } hours = 1\frac { 1 }{ 2 }$$ hrs.
Hence, the required time $$x= 1\frac { 1 }{ 2 }$$ hours.