Help With Conversions?

Question

1. How many Gigameters is equal to 388 miles?

4. I can ride a bicycle at a velocity of 5.655x10^9 nm/sec. What is the velocity in miles/hour?

(number 4 is a double conversion)....

Please help me.

Answer 1

388miles @  1,609 meters / mile @ 1 giga metre / 1e9 metres =  0.000624  gigameter (aka 6.24e-4 gigametres)

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I can ride a bicycle at a velocity of 5.655x10^9 nm/sec. What is the velocity in miles/hour?

5.655x10^9 nm/sec @ 1 metre/ 1e9nm @  1 mile / 1,609 meters = 0.003514 mile/ sec

0.003514 mile/ sec @ 3600 sec/hour = 12.65 mph

your answer is : 12 65 mph