Question

a bus travel first 240 kilometre at a speed of 80 kilometre per hour and next 360 kilometre at a speed of 90 kilometre per hour what is thle average speed​

Answer 1

Answer:-

Given:

Distance travelled in first interval = 240 km

Speed of the bus in first interval = 80 km/h

We know that,

Time = Distance/Speed

So, Time taken to travel 240 km = 240/80

⟶ Time taken to travel 240 km = 3 hrs

Also given that,

Distance travelled by the bus in second interval = 360 km

Speed of the bus in second interval = 90 km/h

⟶ Time taken to travel 360 km = 360/90

⟶ Time taken to travel 360 km = 4 hrs

We know,

Average speed = Total distance travelled/total Time taken.

• Total distance travelled = 240 + 360 = 600 km.

• Total Time taken = 3 + 4 = 7 hrs

So, Average speed of the bus = 600/7

⟶ Average speed of the bus = 85.7 km/h

Answer 2

Explanation:

Given :

• a bus travel first 240 kilometre at a speed of 80 kilometre per hour .

• next 360 kilometre at a speed of 90 kilometre per hour

To Find :

• what is thle average speed

Solution :

Let x is the first 240 km speed of 80 km/h

Let y be the next 360 km at a speed of 90 km/h

Now the average speed is

= x + y / 2

Substitute all value :

= 80 + 90 / 2

= 170 / 2

= 85

Therefore the average is 85 km per hour