Question

Jace sets off from her home to visit her friend.

She first travels by train for the first 30 km at a speed of 60 km/h.
She then took a bus for 1 hour 30 minutes at an average speed of 50 km/h.
Calculate her average speed for the whole journey.

Answer 1

• Jace's average speed for the whole journey is 52.5 km/h.

Explanation:

• Average speed = Total distance / Total time

Total distance is:

• 30 + 1.5*50 =
• 30 + 75 =
• 105 km

Total time is:

• 30/60 + 1.5 =
• 0.5 + 1.5 =
• 2 hours

Average speed is:

• 105/2 =
• 52.5 km/h