Question

sela 10 aple eat 1 minute who 7aple on time

Answer 1

[1 min=60 sec]
sela takes 60 sec for 10 apples
then, sela will take (60/10*7)=42 sec
therefore, sela will take 42 sec to eat 7 apples.

Answer 2

Secs in one min= 60
10 apples in 60 secs
so,
1 apple = 60/10
7 apples = 60/10 * 7
= 42 secs.....