A man covers a total distance of 100 km on bicycle . For the first 2 hours, the speed was 20 km/hr and for the rest of the journey , it came down to 10 km/hr. The average speed will be
To find the average speed for the entire journey, you can use the formula:
Average Speed = Total Distance / Total Time
In this case, the total distance is 100 km, and the total time can be calculated by adding the time for the first part of the journey (2 hours) and the time for the second part of the journey (the remaining time).
For the first part: Distance = 20 km/hr * 2 hr = 40 km
For the second part: Distance = 10 km/hr * (total time - 2 hr)
Now, let's calculate the total time for the second part: Total Time = Total Distance / Speed Total Time = (100 km - 40 km) / 10 km/hr Total Time = 60 km / 10 km/hr Total Time = 6 hours
Now, calculate the distance for the second part: Distance = 10 km/hr * 6 hr = 60 km
So, the total distance is 40 km (first part) + 60 km (second part) = 100 km.
Now, you can calculate the average speed: Average Speed = Total Distance / Total Time Average Speed = 100 km / (2 hr + 6 hr) = 100 km / 8 hr = 12.5 km/hr
The average speed for the entire journey is 12.5 km/hr.
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