Total distance of a journey is 250 km. X covered the first 20 km at a

1.	Total distance of a journey is 250 km. X covered the first 20 km at a speed of 40 km/h, the next 140 km at 70 km/h, and the remaining journey at 18 km/h. Find the average speed to complete the journey.1. 33.33 km/h2. 35 km/h3. 32 km/h4. 43 km/h5. 42 km/h
Answer» Correct Answer - Option 1 : 33.33 km/h Given: Total distance covered = 250 km Speed in the first part of the journey = 40 km/h Speed in the second part of the journey = 70 km/h Speed in the third and final part of the journey = 18 km/h Formula used: Speed = Distance/Time Average speed = Total distance/Total Time Calculation: Average speed = 250/{(20/40) + (140/70) + (90/18)} ⇒ 250/[(1/2) + 2 + 5] ⇒ 250/(15/2) ⇒ (500/15) ⇒ 33.33 km/h ∴ The average speed of the whole journey is 33.33 km/h.

Total distance of a journey is 250 km. X covered the first 20 km at a speed of 40 km/h, the next 140 km at 70 km/h, and the remaining journey at 18 km/h. Find the average speed to complete the journey.1. 33.33 km/h2. 35 km/h3. 32 km/h4. 43 km/h5. 42 km/h

Answer» Correct Answer - Option 1 : 33.33 km/h

Given:

Total distance covered = 250 km

Speed in the first part of the journey = 40 km/h

Speed in the second part of the journey = 70 km/h

Speed in the third and final part of the journey = 18 km/h

Formula used:

Speed = Distance/Time

Average speed = Total distance/Total Time

Calculation:

Average speed = 250/{(20/40) + (140/70) + (90/18)}

⇒ 250/[(1/2) + 2 + 5]

⇒ 250/(15/2)

⇒ (500/15)

⇒ 33.33 km/h

∴ The average speed of the whole journey is 33.33 km/h.

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