Speed of ram while travelling from point A to point B is 50 km/hr and

1.	Speed of ram while travelling from point A to point B is 50 km/hr and while returning he decreased his speed by 40%. Find his average speed of whole journey.1. 33.33 km/hr2. 35.75 km/hr3. 42.55 km/hr4. 37.5 km/hr
Answer» Correct Answer - Option 4 : 37.5 km/hr Given: Speed of Ram while travelling from point A to point B = 50 km/hr Speed decreased by 40% while returning Formula used: Average speed when the distance is same = 2xy/(x + y) Where, x = Speed while going y = Speed while returning Calculation: Speed while returning = 50 × [(100 – 40)/100] km/hr ⇒ 50 × (60/100) km/hr ⇒ 30 km/hr Now, average speed = (2 × 50 × 30)/(50 + 30) km/hr ⇒ (100 × 30)/80 km/hr ⇒ 37.5 km/hr ∴ The average speed of the whole journey is 37.5 km/hr

Speed of ram while travelling from point A to point B is 50 km/hr and while returning he decreased his speed by 40%. Find his average speed of whole journey.1. 33.33 km/hr2. 35.75 km/hr3. 42.55 km/hr4. 37.5 km/hr

Answer» Correct Answer - Option 4 : 37.5 km/hr

Given:

Speed of Ram while travelling from point A to point B = 50 km/hr

Speed decreased by 40% while returning

Formula used:

Average speed when the distance is same = 2xy/(x + y)

Where, x = Speed while going

y = Speed while returning

Calculation:

Speed while returning = 50 × [(100 – 40)/100] km/hr

⇒ 50 × (60/100) km/hr

⇒ 30 km/hr

Now, average speed = (2 × 50 × 30)/(50 + 30) km/hr

⇒ (100 × 30)/80 km/hr

⇒ 37.5 km/hr

∴ The average speed of the whole journey is 37.5 km/hr

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