A bus travels a distance of 120km with a speed of 40km/h and returns with a speed of30km/h. Calculat the average speed for the entire journey.

34.2 km / hr

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32.4 km / hr

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30 km / hr

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40 km / hr

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Solution

The correct option is
A

34.2 km / hr

Distance = 120 km
speed= 40 km / hr
speed = distance / time
time = distance/ speed= 3 hour

for return of bus
distance = 120 km
speed = 30 km/ hr
time = 4 hr

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

$= \frac{(120 + 120)}{(3 + 4)}$
$= 34.2 k m / h r$

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A bus travels a distance of 120km with a speed of 40km/h and returns with a speed of30km/h. Calculat the average speed for the entire journey.

The correct option is A 34.2 km / hrDistance = 120 km speed= 40 km / hr speed = distance / time time = distance/ speed= 3 hour for return of bus distance = 120 km speed = 30 km/ hr time = 4 hr average speed =total distancetotal time taken =(120+120)(3+4)=34.2 km/hr