CTET 2 Math and Science Nov 2012 Paper

Question : 52 of 120

Marks: +1, -0

A car goes one kilometer at 30 km per hour and then goes another kilometer at 40 km per hour. The average speed (in km/hour) of the car for 2 km is

Solution:

\text"Average speed"=\;\;{\;\text"Tota Distance"\;}/{\;\text"Total Time"\;}

⇒\;\;{2}/{\;\;{1}/{30}+\;\;{1}/{40}}{km}{/}{hr}

⇒\;\;{1200×2}/{70}⇒\;\;{2400}/{7}⇒34{2}/{7}{km}{/}{hr}

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