Question

A truck covers a distance 150 kms at a certain speed and then covers another 200 kms of average speed which is 20 kmlhor more than first speed. If it cover total distance in 5 hours find it first speed​

Answer 1

Answer: 60 km/hr.

Step-by-step explanation:

Let the 1st speed be x.

Then, the next speed will be x+20,

A.T.Q

150/x+200/x+20=5

From here, we can see that the difference between the speed and distance tells that the both the distances are covered in 2.5 hours.

150/x=2.5

x=150/2.5

x=60 km/hr. --------------------------------(1)

200/x+20=2.5

x+20=200/2.5

x+20=80

x=80-20

x=60. ---------------------------------------------(2)

As, the value in both the equations is same.

Our answer is correct.

Therefore, the 1st speed is 60 km/hr.

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