Question

An aeroplane goes from country A to B with an average speed of 450 km/h and returns woth an average speed of 300 km/h. find the distance between the two countries if the flight takes 15 hours in all

Answer 1

Answer:

Step-by-step explanation:

Let the time taken in the first part of the journey be t

So the time taken in next part of the journey is (15-t)

Now we all know , distance=speed *time

So, the distance remains same in both the cases.

According to the problem, we can make tha equation,

450t= (15-t)*300

Or, 450t+300t=4500

Or t= 6

So the time taken for the flight in the avg speed of 450miles/hr is 6hrs.

So the distance coverd was 450*6= 2700miles.

Hence the distance between A and B is 2700miles

Answer 2

Answer:

Step-by-step explanation:

Step-by-step explanation:

Let the time taken in the first part of the journey be t

So the time taken in next part of the journey is (15-t)

Now we all know , distance=speed *time

So, the distance remains same in both the cases.

According to the problem, we can make tha equation,

450t= (15-t)*300

Or, 450t+300t=4500

Or t= 6

So the time taken for the flight in the avg speed of 450miles/hr is 6hrs.

So the distance coverd was 450*6= 2700miles.

Hence the distance between A and B is 2700miles