Question

6. A car moves with a speed of 40 km/h for
15 minutes and then with a speed of
60 km/h for the next 15 minutes. The total
distance covered by the car is: (2)
(i) 100 km
(ii) 25 km
(iii) 15 km
(iv) 10 km​

Answer 1

Answer:

Option 2nd : 25km is correct

Explanation:

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

Distance covered = speed × Time taken

60 minutes = 1 hour

15 minutes =   15/60 hour

 

 Distance covered = 240×  15/60=10km

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

Distance covered = 60×  15/60=15km

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

∴ 25 km is correct