4. 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. Find the total distance covered by the car ir
these 30 minutes.
Answers
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
hope these helps you
have a great time
Explanation:
Speed of the car in the first 15 minutes = 40 km/h
So, distance traveled in the first 15 minutes will be = speed x time
Distance = 40km/h x 15 minutes
Distance = (40 x 15/60) km = 10 km
Speed in next 15 minutes = 60 km/h
Distance traveled in next 15 min= speed in next 15 minutes × time
= 60 km/h x 15 min
= 60 × 15/60 h
Distance in next 15 minutes = 15 km
The total distance covered by car = distance in first 15 min+ distance in next 15 min
Total distance = 10+15
= 25 km.