Heon and Ami are both travelling by train. Heon's train travels 120 km in 90 minutes. Ami's train travels 375 km. It leaves at 11:25 and arrives at 15:10. Work out the difference, in km/h, between the average speed of their trains.

20 km/h

Step-by-step explanation:

Speed = Distance / Time

Heon Train:

Translate minutes to hours:

90 minutes = 1.5 hours

= 120 / 1.5

= 80 km/h

Ami's Train

Train leaves at 11:25 and arrives at 15:10.

15:10 - 11:25 = 3hours 45 minutes

3 hours 45 minutes in minutes = (60 * 3) + 45 = 225 minutes

225 minutes in hours is = 225/60 = 3.75 hours

Speed of train = 375 / 3.75

= 100 km/h

Difference between average speeds:

= 100 - 80

= 20 km/h

answer: translate the circles so they share a common center point and dilate circle y by a scale factor of 3.

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