Question

Calculate the average speed of a car which travel 20 km at 40 km h-1 and 90 km at 60 km h-1

Answer 1

Answer:

here is your answer

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Answer 2

Answer:

Explanation:

we know that ,      $Distance=\frac{Speed}{Time}$

Therefore,

$V_{1} =40 kmh^{-1} \\D_{1} = 20km \\Time taken (T_{1})= \frac{20}{40} = \frac{1}{2} h \\\\V_{2} = 60kmh^{-1} \\D_{2} = 90km\\TimeTaken(T_{2} )=\frac{90}{60} =\frac{1}{3} h$    

Now,

Average Speed = $\frac{Total Distance}{Total Time Taken}$ = $\frac{20+90}{\frac{1}{2} +\frac{1}{3} } = 132 kmh^{-1}$

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