An object moves 15 m in 2.6 min and the next 26 km at a speed of 30 km/h. Find its average speed (in m/sec) for the whole movement
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 7.93.
Distance = 26 km or 26000 m
For first part
An object moves 15 m in 2.6 minutes = 2.6 × 60 = 156 sec
For second part
Distance = 26 km or 26000 m
Speed = 30 km/hr = 8.33 m/sec
Total distance = 15 + 26000 = 26015 m
Time taken = 156 + 26000/8.33 = 156 + 3121.24 = 3277.24 sec
Average speed = Total distance/Total time
Average speed = 26015/3277.27 = 7.93