Question

when and how are these used?
a. A stop watch
b. An egg-timer​

Answer 1

Answer:

a. A stop watch

Explanation:

when and how are these used?

Answer 2

Answer:

A stopwatch is a handheld timepiece designed to measure the amount of time that elapses between its activation and deactivation. ... A press of the second button then resets the stopwatch to zero. The second button is also used to record split times or lap times.

An egg timer or kitchen timer is a device whose primary function is to assist in timing during cooking; the name comes from the first timers initially being used for the timing of cooking eggs. Early designs simply counted down for a specific period of time.