Question

a car covers first 100km in3hr,next 120 km in 4hrs and the final 180 km in 7 hrs .calculate it's average speed for the entire journey​

Answer 1

Explanation:

(i) How much distance will the car cover in 3 hours with the same speed ?

(ii) How much time will the car take to cover 54 km with the same speed?

Solution

Transcript

Solution:

Distance covered by car 180 km in 5 hours

(i) Distance covered in 1 hour = \frac{180}{5}=36km

5

180

=36km

Distance covered in 3 hours = 3 x 36 = 108 km

(ii) To cover a distance of 180 km , time taken = 5 hours

To cover a distance of 1 km , time taken = \frac{5}{180}

180

5

To cover a distance of 54 km, time taken = \frac{5}{180}\times54=1.5hours

180

5

×54=1.5hours