Matt went mountain biking on a trail that is 13.5 miles each way. It took Matt 2 hours and 15 minutes to bike the 13.5 miles uphill. If it took 1 hour and 30 minutes to bike the 13.5 miles downhill back home, what was Matt's average speed for his round trip?

there are no choices to this, can you give us some choices so that i can answer it

step-by-step explanation:

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- : )

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

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