Question

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) 100Km

(ii) 25Km

(iii) 15Km

(iv) 10Km

Answer 1

(ii) 25 km-------------------

Solution:
Case I:
Speed = 40 km/h
Time = 15 min = 15/60 hour
Distance = Speed × Time = 40×15/60=10 km
Case II:
Speed = 60 km/h
Time = 15 min = 15/60 hour
Distance = Speed × Time = 60×15/60=15 km
Total distance = 10 km + 15 km = 25 km