A family takes a summer vacation to Florida. They drive for 8 hours before stopping at a hotel for the night. They stay at the hotel for 12 hours before going back on the road and driving for another 10 hours. The total distance
travelled was 1560 km. What was the average speed of the trip? [Average speed = total distance/total amount of
time)

Average speed of the trip = 52 km/hr

Distance is the length traveled by an object within a certain of time .

Average speed = total distance/total amount of  time ,

Can be formulated :

Total distance travelled : 1560 km

Total time : 8 hr + 12 hr + 10 hr = 30 hr

b i think it’s a water wheel turning in a stream

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-