Evan is just leaving his house to visit his grandmother. Normally, the trip takes him 35 minutes on the freeway, going 70 mph. But tonight he's running 5 minutes late. How fast will he need to drive on the freeway to make up the 5 minutes?

Evan drive at speed = 81.67 m/hr

Explanation:

Normal speed of Evan = 70 m/hr

Time taken by Evan to visit his grandmother = 35 min = hr

Distance covered by Evan = =

                                            = miles

According to the problem, one day Evan was running 5 minutes late. So, the time Evan has to visit his grandmother is 30 mins.

To reach on time, Evan should be drive at the speed :

Speed =

           =

          = 81.67 m/hr

i think the answer is a, hope this is right, that would be my best guess.

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂