Question

The speed of the train going from nagpur to allahabad is 100 km/h while when coming back from allahabad to nagpur, its speed is 150 km/h. Find the average speed during whole journey.

Answer 1

Answer:

120 kmph

Explanation:

Vavg = 2v1v2/v1+v2

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Answer 2

Given :

Speed of train going from Nagpur to Allahabad is  , u = 100 km/h .

Speed of train while coming back from Allahabad to Nagpur is , v = 150 km/h .

To Find :

The average velocity of the whole journey .

Solution :

We know , average of two quantity x and y is given by :

$Avg =\dfrac{x+y}{2}$

Therefore , average velocity of the journey is :

$v_{avg}=\dfrac{u+v}{2}\\\\v_{avg}=\dfrac{100+150}{2}\\\\v_{avg}=\dfrac{250}{2}\\\\v_{avg}=125\ m/s$

Therefore , average velocity of the journey is 125 m/s .

Learn More :

Kinematics

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