Question

A space shuttle travels around the Earth at a constant

speed of 28000 kilometers per hour. If it takes 90 minutes to
complete one orbit, how far is its journey around Earth?
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Sheet 1

Answer 1

42,000 km

Step-by-step explanation:

Convert 90 minutes to 1 hour.

• 90 min → 1.5 hr

It takes the space shuttle 1.5 hours to complete one orbit. In one hour, the space shuttle can travel 28,000 km.

Therefore, we can use a proportion to solve for the distance the space shuttle can travel in 1.5 hours using its rate for one hour.

• 28,000 km/1 hour = x km/1.5 hours

Cross-multiply.

• x = 28,000 · 1.5
• x = 42,000

The space shuttle's journey is 42,000 km around Earth.