Question

a car travels 80 km at a uniform speed of 40 km per hour and next 30 km at a uniform speed of 20 km/h.find its average speed

Answer 1

Hope this answer helps. Hope you understand.

Answer 2

Given:

Speed in Case 1 = 40 km /h

Distance travelled in Case 1 = 80 km

Speed in Case 2 = 20 km /h

Distance travelled in Case 2 = 30 km

Average Speed = ?

Solution:

We know that Speed = Distance /Time

=> Time in Case 1 = Distance travelled in Case 1 /Speed in Case 1

= 80 /40 = 2 Hours

Similarly, Time in Case 2 = Distance travelled in Case 2 /Speed in Case 2

= 30 /20 = 1.5 Hours

We know that Average Speed = Total distance travelled /Total Time taken

=> Average speed = [80 + 30] /[2 + 1.5]

= 110 /3.5

= 31.43 km /h [approximately]

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