A car moving on a straight road covers one third of the distance with 20 km/hr and the rest with 60 km/hr. The average speed is

40 km/hr

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80 km/hr

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36 km/hr

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Solution

The correct option is D
36 km/hr

Average speed = $\frac{T o t a l d i s t a n c e}{T o t a l t i m e}$

$= \frac{x}{t_{1} + t_{2}}$

= $\frac{x}{\frac{\frac{x}{3}}{v_{1}} + \frac{\frac{2 x}{3}}{v_{2}}}$

$= \frac{1}{\frac{1}{3 \times 20} + \frac{2}{3 \times 60}}$

$= 36$ km/hr

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A car moving on a straight road covers one third of the distance with 20 km/hr and the rest with 60 km/hr. The average speed is

The correct option is D 36 km/hr Average speed = Total distanceTotal time =xt1+t2 = xx3v1+2x3v2 =113×20+23×60 =36 km/hr

The correct option is D
36 km/hr

Average speed = $\frac{T o t a l d i s t a n c e}{T o t a l t i m e}$

$= \frac{x}{t_{1} + t_{2}}$

= $\frac{x}{\frac{\frac{x}{3}}{v_{1}} + \frac{\frac{2 x}{3}}{v_{2}}}$

$= \frac{1}{\frac{1}{3 \times 20} + \frac{2}{3 \times 60}}$

$= 36$ km/hr