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Question 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

Answer

(ii) 25 km

Case 1.
Speed = 40 km/h
Time = 15 min = (15/60) hour
Distance (d1) = speed x time = 15/60= 10 km

Case 2.
Speed = 60 km/h
Time = 15 min = (15/60)hour
Distance(d2) = speed x time = 60*(15/60) = 15 km
Total distance (d) = (d1 + d2) = 10 km + 15 km = 25 km

Therefore, the total distance covered by the car = 25 km.

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