Harshvardhan walks from home to school with a speed of 4 km per hour and returns home with 2km per hour . Find the average speed of the whole journey?

Open in App

Solution

Let the distance between home and school = x km

Case 1

Speed = 4 km/h

Distance = x km

Time = Distance/Speed

= (x/4) hrs.

Case 2

Speed = 2 km/h

Distance = x km

Time = Distance/Speed

= (x/2) hrs.

Now, Total Distance covered by boy = 2x km

Total Time taken = x/4 + x/2

= (x + 2x)/4

= 3x/4

= (3x/4) hrs.

Avreage speed of boy = Total Distance covered / Total Time taken

= 2x/3x/4

= 8/3 km/h

Suggest Corrections

Similar questions

Q. The speed of one way journey from home to airport averaged at

45

miles per hour. A return journey along the same route, but with traffic, speed averaged at

30

miles per hour. If the total travel time was

2

hours and

30

minutes, then how much distance (in miles) is yet to cover to reach home?

Man walks in a straight road from his home to a market 2.5 km away with a speed of 5 km per hour finding the market closed he instantly turn and walked back to home with a speed of 7.5 km per hour the average speed of an over the interval of zero to 40 minute is equal to.

Distance between two stations Vizag and Bangalore is 780 km. A train covers the journey from Vizag to Bangalore at 86 km per hour and returns back to Vizag with a uniform speed of 65km per hour. Find the average speed of the train during the whole journey?

Q. Sunita walks to her school at a speed of

4 k m

per hour and takes

9

minutes to reach the school in time. One day she reached the school

3

minutes late. At what speed did she walk that day assuming that she did not start late from home.

Q. A motorcycle driver drive a cab with a uniform speed of

30

km per hours and return back with the speed

20

km per hours, find the average speed?

Join BYJU'S Learning Program