Question

Battery was charged. when the charging began it was 23% full after 30 minutes of charging the battery was 89% full. how fast was the battery charged? How long did it take the battery to be funny charged?

Answer 1

The battery was charged at a rate of 2.2 percent per minute.It took the battery 35 minutes to be fully charged.

Answer 2

The battery was charged at a rate of 2.2 % per minute.

It took 35 minutes to fully charge the battery

Explanation:

Initial amount of charge = 23%

Charge after 30 minutes = 89%

Percentage of charge gained in 30 minutes = 89-23

= 66 %

Charging speed of battery =
`\frac{percentage\hspace{3}of\hspace{3}charge\hspace{3}gained}{time\hspace{3}taken\hspace{3}in\hspace{3}minutes}`

=
`(66)/(30)`

= 2.2 % per minute

2.2% charge takes 1 minutes

1% charge takes
`(1)/(2.2)` minutes

Initially it was 23% charged so it needs 77% more charge to be fully charged.

So, 77% charge takes
`(1)/(2.2)*77` minutes

=
`(100)/(2.2)` minutes

= 35 minutes