Question

Arun covers first 28 kms of his journey in 45 minutes and the remaining 32 kms in 35 minutes. What is his average speed in m/s ?

• A. \(12\frac{1}{2}\)
• B. 13
• C. 15
• D. \(16\frac{1}{2}\)

Answer 1

The Correct Option is A

To calculate Arun's average speed in meters per second, we first need to determine the total distance covered and the total time taken for the journey.

Step 1: Calculate Total Distance

Total distance = 28 km + 32 km = 60 km

Step 2: Convert Distance to Meters

1 km = 1000 meters, therefore, 60 km = 60000 meters

Step 3: Calculate Total Time

Total time = 45 minutes + 35 minutes = 80 minutes

Step 4: Convert Time to Seconds

1 minute = 60 seconds, therefore, 80 minutes = 4800 seconds

Step 5: Calculate Average Speed

Average speed = Total distance / Total time

Average speed = 60000 meters / 4800 seconds

Average speed = 12.5 meters/second

Thus, Arun's average speed is \(12\frac{1}{2}\) m/s.