Question

A car driver increases the average speed of his car by 3 km/hr every hour. The total distance travelled in 7 hours if the distance covered in first hour was 30 km, is

Answer 1

Explanation:

Distance travelled in 1st hour=26

Speed increases by 3 km/hr so next hour distance travelled would be 29 and so on ….

So the figures would be 26 29 32….

No. Of. Hours =12

We can apply the sum of A.P formula =n/2(2a+(n-1)d)

Where n=12,a=26,d=3

Thus we get ,Total distance = 6(52+33)=510 km(Answer)