A car moving with a speed of 40km/hr takes 15 minutes to cover each side of a square field
(PQRS) as shown. The perimetre of the square field is
S:
R
a) 40km
Field
b) 60km
PL
lo
c) 160km d) 240km
Answers
Answer:
Explanation:
Given :
v = 40 kmph
t = 15 min for each side
Square field
Procedure :
As the car takes 15 minutes to cover each side of the square, Hence he must take (15 × 4) minutes to cover all the sides of the square, (As squares have 4 sides) Assuming the velocity is constant throughout the journey (Assuming he doesn't apply breaks while turning).
Hence he takes 60 minutes to cover all the sides of the square.
60 minutes = 1 hour (As we took speed as kmph units)
As s = v · t
⇒ s = 40 × 1 = 40 km
Hence the distance he travelled throughout his journey is 40 km, i.e. the perimetre of the square is 40 km.
Hence (a).
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