A digital stop-clock measures time in minutes and seconds. The stop-clock reads 00:50 when it is started (i. e. 00 minutes 50 seconds).

It reads 02:10 when it is stopped.

What is the shortest possible time that has elapsed between starting and stopping the

stop-clock?​

01:20 (1 minute 20 seconds)

Explanation:

subtract the starting time from the stopping time to get the time used: 02:10 - 00:50 = 01:20

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

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