Reema takes 21 5
minutes to walk across the school ground. Jaydeep takes 7
4
minutes to cover the same distance. Who takes less time and by what fraction?

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

14 ft 7 inches

step-by-step explanation:

since each model inch corresponds to 25 real inches, 7 model inches will correspond to

7×25" = 175"

at 12" per foot, that is 14 feet, 7 inches.

at least two

step-by-step explanation:

the answer is c

step-by-step explanation: i took a test with this question on it