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What is the average speed(in km/hr)  of Deepti, if she covers 240 km in 3  hours and the same distance covered with the speed of 20m/s. 
1. 80 
2. 72
3. 70
4. 75.7

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Correct Answer - Option 4 : 75.7

Given : 

Time taken by Deepti to cover 240 km = 3 hrs 

Formula Used: 

Distance = speed ×  time 

Average Speed = 2 × S× S2/(S+ S2)

Calculation: 

⇒ Speed of Deepti in 1st part = 240/3 = 80 km/hr 

⇒ Speed of Deepti in 2nd part = 20 × (18/5) = 72 km/hr 

⇒ Average Speed = 2 × 80 × 72/152 

⇒ 75.7 km/hr 

∴ The average speed of deepti is 75.7 km/hr 

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