Answer:
i guess it is 262.5 km
Explanation:
first we want to get the speed of the car so:315÷3=105 km/hr
then we will multiply this number by 2½ (2hrs and 30mins), it will be 262.5km
OR:
it is a proportion question so you can do this very simple trick
315---->3hrs
x--------> 2 hrs 30 mins and then do:
2½ x 315/3
you can use this method on any proportion question.
hope it helps