Let the time taken by the car to reach the destination, while travelling with a speed of 80 km/hr, be x hours.

The following table is obtained.

Speed (in km/hr) | 60 | 80 |

Time taken (in hours | 2 | x |

More the speed of the car, lesser will be the time taken by it to reach the destination.

Hence, the speed of the car and the time taken by the car are inversely proportional

to each other. Therefore,

60 × 2 = 80× x

x = (60 x 2)/80 = 3/2 = 1 1/2

The time required by the car to reach the given destination is 1 1/2 hours.