Answer :
The car rate in km/min is found by,
[tex]90km \div 60mins = 1.5 \frac{km}{mins} [/tex]
Then the car will travel this in 20mins,
[tex]1.5 \frac{km}{mins} \times 20mins = 30km[/tex]
[tex]90km \div 60mins = 1.5 \frac{km}{mins} [/tex]
Then the car will travel this in 20mins,
[tex]1.5 \frac{km}{mins} \times 20mins = 30km[/tex]