A car covers the first 30 km in 30 min and the next 30 km in 40 min. Calculate the average speed for the entire journey.

$51.2 k m / h$

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$55.5 k m / h$

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$51.4 k m / h$

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$52.4 k m / h$

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Solution

The correct option is C
$51.4 k m / h$

Total distance covered $= 30 k m + 30 k m = 60 k m$

Total time taken $= 30 m i n + 40 m i n = 70 m i n$

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

= $\frac{60 k m}{(\frac{70}{60} h)}$

= $51.4 k m / h$

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A car covers the first 30 km in 30 min and the next 30 km in 40 min. Calculate the average speed for the entire journey.

The correct option is C 51.4 km/h Total distance covered = 30 km+30 km = 60 km Total time taken = 30 min+40 min = 70 min Average speed = Total distanceTotal time = 60 km(7060 h) = 51.4 km/h

The correct option is C
$51.4 k m / h$

Total distance covered $= 30 k m + 30 k m = 60 k m$

Total time taken $= 30 m i n + 40 m i n = 70 m i n$

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

= $\frac{60 k m}{(\frac{70}{60} h)}$

= $51.4 k m / h$