Question

A car covers 1÷3 of total distance with velocity 100 km

Answer 1

Please post the full question my dear.

Answer 2

 to be travelled = 180 km

1/3rd distance = 60 km

Now, left distance is 120 km

To travel 60 km at the speed of 60 km/h, Time taken =1 hour

To travel 120 km at the speed of 30 km/ h, Time taken = 4 hour

Therefore Average Speed = total distance÷ total time = 180/5 = 36 km/h.

Note: 180 km distance taken for simplicity of calculation. One may try taking any distance and yet the answer will remain same.

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