Question

Question #ea410

Answer 1

`0.0005` seconds.

Explanation:

Set up a ratio

8 hours equals 28800 seconds.

`8 xx 60 xx 60 = 28800`

let x equal the seconds lost in 15 seconds.

`10 /28899 = x/ 15 " "(larr" Time lost")/(larr"Total time")`

multiply both sides by 15

`( 10 xx 15)/28800 = ( x xx 15)/15` This leaves

`150/28800 = x`

`0.0005 = x`

Answer 2

12 hours

Explanation:

The watch loses `10` seconds in `8` hours .
To find:in how much tiem will it lose 15 seconds .
Set up a ratio for it like
`8:10::x:15`
`x=15×8/10=12`
answer 12 hours