Answer:
The distance cover by teacher in 30 minutes is 4
miles .
Explanation:
Given as :
The distance cover by student = d = 3
miles
i.e d =
miles
The time taken by student to cover
miles distance = t = 30 minutes
Let The speed of student = s miles per minute
∵ Speed =

Or, s =

Or, s =

i.e s = 0.111 miles per min
So, The speed of student = s = 0.111 miles per min
Now, Again
The speed of teacher = 1
times as fast as student
Let The speed of teacher = S miles per min
∵ The speed of teacher =
× speed of student
So, S =
× s
Or, S =
× 0.111 miles per min
Or, S =
mil/min
i.e, S = 0.13875 miles per min
So, The speed of teacher = S = 0.13875 miles per min
Let The distance cover by teacher = D miles
The time taken by teacher to cover D miles distance = T = 30 minutes
∵ Distance = Speed × Time
Or, D = S × T
Or, D = 0.13875 miles per min × 30 min
∴ D = 4.1625 miles
i.e D = 4
miles
So, The distance cover by teacher in 30 minutes = D = 4
miles
Hence,The distance cover by teacher in 30 minutes is 4
miles . Answer