A train has a speed of 60 km/h for the first one hour and 40 km/h for the next half hour. Its average speed in km/h is

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53.33

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Solution

The correct option is B
53.33

Distance travelled by train in first 1 hour is 60 km and distance in next $\frac{1}{2}$ hour is 20 km.

$v_{a v g} = \frac{60 + 20}{1.5}$

$= 53.33$

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a) A train travels a distance with a speed of 40 km/h and returns with a speed of 60 km/h. Calculate the average speed of the train.

b) On a 60 km track, a train travels the first 30 km at a uniform speed of 30 km/h. How fast must a train travel the next 30 km so that the average speed is 40 km/hr for the entire trip?

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A train has a speed of 60 km/h for the first one hour and 40 km/h for the next half hour. Its average speed in km/h is

The correct option is B 53.33 Distance travelled by train in first 1 hour is 60 km and distance in next 12 hour is 20 km. vavg=60+201.5 =53.33

The correct option is B
53.33

Distance travelled by train in first 1 hour is 60 km and distance in next $\frac{1}{2}$ hour is 20 km.

$v_{a v g} = \frac{60 + 20}{1.5}$

$= 53.33$