Question

a car moves with the speed of 40km/h for 15 minutes and then with the speed of 60km/h for the next 15 minutes. Find out the total distance by the car in this 30 minutes​

Answer 1

Answer:

25

Explanation:

Speed of car in first 15 minutes = 40 km/h

Distance covered = speed × Time taken

60 minutes = 1 hour

15 minutes =

60

15

hour

Distance covered = 240×

60

15

=10km

Speed of car in next 15 minutes = 60 km/h

Distance covered = 60×

60

15

=15km

∴ Total distance covered = (10+15)km = 25 km

∴ 25 km is correct

Answer 2

Since the car at first travels at a speed of 40 Km/Hr for 15 mins and then at the speed of 60 kms/Hr for next 15 mins.

The the average speed of the car = (40 + 60) / 2 = 100/2 = 50 Kms/Hr. = 50 Kms/60 mins = 56/60 = 0.833334 Kms/Min

So the distance travelled by the Car in 30 mins = 0.833334 x 30 = 25 Kms

Ans: 25 kms