1.

Mr. Sunil covers his upward journey at 55 km/h and downward journey at 45 km/h. Find his average speed.1. 35.5 km/h2. 45.5 km/h3. 49.5 km/h4. 39.5 km/h

Answer» Correct Answer - Option 3 : 49.5 km/h

Given:

Speed at upward journey = 55 km/h

Speed at downward journey = 45 km/h

Formula used:

Average speed = Total distance/Total time

Calculation:

Let distance be 495 (LCM of 55 and 45)

⇒ (495 + 495)/[(495/55) + (495/45)]

⇒ 990/20

⇒ 49.5

∴ Average speed is 49.5 km/h


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