10. 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:
(i) 100 km (ii) 25 km (iii) 15 km (iv) 10 km
The correct option is (ii)
Answer = 25 km
1st case,
Speed = 40 km/hr
and time taken = 15 min
So, distance =
Case 2nd,
Speed = 60 km/h
Time taken = 15 min = 0.25 h
So, Distance travelled =
So, total distance = 15 + 10 = 25 km