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Option A and C

Step-by-step explanation:

First of all we know the speed formula,

So to find time,

Now let’s find the time of each option

Option a:

Speed = 60 mph

Distance : 120 miles

Time = 120/60

= 2 hours

Therefore option a is correct

Option b:

Speed = 3 mph

Distance = 1.5 miles

Time = 1.5/3

= 1/2 hours

Therefore option b is not applicable.

Option c:

Speed = 80 mph

Distance = 160 miles

Time = 160/80

= 2 hours

Therefore option c is correct.

Option A and C are the answers

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  about 5.6 days

step-by-step explanation:

we can fill the given information into the decay equation and solve for the value of t at which half the sample remains.

the half-life is about 5.6 days.

step-by-step explanation: