Manoj travels from Mumbai to Ahmedabad by car in 5 hours. The speed of the car during first hour of the journey was 60 km/hr. For the next two hours speed was 80 km/hr. Next hour it was 100 km/hr. Finally, during the last hour of his journey he drove at 40 km/hr. What is the average speed during his journey?56 km/hr67.4 km/hr70 km/hr72 km/hr
Question
Manoj travels from Mumbai to Ahmedabad by car in 5 hours. The speed of the car during first hour of the journey was 60 km/hr. For the next two hours speed was 80 km/hr. Next hour it was 100 km/hr. Finally, during the last hour of his journey he drove at 40 km/hr. What is the average speed during his journey?56 km/hr67.4 km/hr70 km/hr72 km/hr
Solution
To find the average speed, we first need to find the total distance travelled and then divide it by the total time taken.
- In the first hour, Manoj travels at 60 km/hr. So, the distance covered = speed x time = 60 km/hr x 1 hr = 60 km.
- In the next two hours, he travels at 80 km/hr. So, the distance covered = speed x time = 80 km/hr x 2 hr = 160 km.
- In the fourth hour, he travels at 100 km/hr. So, the distance covered = speed x time = 100 km/hr x 1 hr = 100 km.
- In the last hour, he travels at 40 km/hr. So, the distance covered = speed x time = 40 km/hr x 1 hr = 40 km.
Adding all these distances together, the total distance travelled = 60 km + 160 km + 100 km + 40 km = 360 km.
The total time taken for the journey = 5 hours.
So, the average speed = total distance / total time = 360 km / 5 hr = 72 km/hr.
Therefore, the average speed during his journey is 72 km/hr.
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