Answer:
Sheri's age = 10
Terry's age = 30
Step-by-step explanation:
Sheri’s age in 20 years time will be the same as Terry’s age is now. Ten years from now.
Let T be the Terry's age
And S be the Sheri's age
Ten years from now, Terry’s age will be twice Sheri’s age
Subtract 10 from both sides
Now we replace T by 2S+10 in the first equation
Subtract S from both sides
S= 10
a is answer because of bodmas rule
ANSWER
EXPLANATION
The average speed
Distance=4km
Time=30mins
Convert time to hours.
Time =0.5hrs