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Samiksha travels first 50 km at the rate of 25 kmph and next 40 km at the rate of 20 kmph. Find her average speed whole journey.
1. 45 kmph
2. 22.5 kmph
3. 60 kmph
4. 37.5 kmph

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Correct Answer - Option 2 : 22.5 kmph

Given:

Speed for 50 km distance = 25 kmph

Speed for 40 km distance = 20 kmph

Formula Used:

Average Speed = Total Distance/Total Time

Calculations:

Speed for 50 km distance = 25 kmph

Speed for 40 km distance = 20 kmph

Total distance = (50 + 40) km

⇒ Total distance = 90 km

Total Time = (50/25) + (40/20)

⇒ Total Time = (2 + 2) hrs. = 4 hrs.

Average Speed = Total Distance/Total Time

⇒ Average Speed = 90/4 = 22.5kmph

∴ The average speed for the whole journey is 22.5 kmph.

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