Answer:
Speed= 60 km/h
Distance to the nearby town= 105 km
Explanation:
Given: Wind speed= 15 km/h
Time taken while going
= 2 h 20 minutes.
Time taken while returning
= 1 h 24 minutes
First we will get the time in uniform unit of hours,
we will convert minutes in hours for
to get

∴

Similarly for

∴

Now, lets take Plane´s speed as a and distance as d.
While going to the nearby town it is headwind,
∴

While returning it is tailwind
∴

Next, we will use the formula,

As distance remain same:

⇒

Now, divide both side by 7
⇒

cross multiplying both side
⇒

∴

Speed of plane is 60 km/h
Now substituting the value of a in either of equation to get distance.

∴ d=

105 km is the distance to the nearby town.