6a. Mike travels in an airplane a distance of
840 km. For one-fourth
of the distance, the
airplane flies at a
speed of 960 km/h, and
for the rest of the
distance, it flies at a
speed of 640 km/h.
How long does the trip
take?

I'm not sure what your asking buddy.. but i know that you can weld two peices of steel by pure force and pressure.

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.