A car moves for half of its time at $80\, km/h$ and for rest half of time at $40\, km/h$. Total distance covered is $60 \,km$. What is the average speed of the car.........$km/h$
A car moves for half of its time at $80\, km/h$ and for rest half of time at $40\, km/h$. Total distance covered is $60 \,km$. What is the average speed of the car.........$km/h$
$60$
$80$
$120$
$180$
A car moves for half of its time at $80\, km/h$ and for rest half of time at $40\, km/h$. Total distance covered is $60 \,km$. What is the average speed of the car.........$km/h$
Time average speed = $\frac{{{v_1} + {v_2}}}{2} = \frac{{80 + 40}}{2} = $$60km/hr$.
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