Question

a floor is 5 long and for M weird a square carpet of side 3 metre is lead on the floor find the area of the floor that is not carpeted ​

Answer 1

Answer:

Speed(S1) = 75 km/hr

Distance(D1) = 30 km

In second case:

Speed(S2) = 60 km/hr

Distance(D2) = 50 km

Formula:

Average Speed = (Total Distance/Total Time)

Time = Distance/Speed

Calculation:

Total Distance = 30 + 50 = 80 km

According to the question:

In first case:

Time = = hrs

In second case,

Time = = hrs

Total Time = + = = hrs

Average Speed = (Total Distance/Total Time)

Average Speed = 80 × = 64.86 = 64.9 km/hr (approx.)

∴ The average speed of whole journey is 64.9 km/hr.

Answer 2

Given :

Length of the floor is 5m

The breadth of the floor is 4m

So, ( applying ar. l×b )

ar. of floor =4m×5m=20m^2

. Side of the carpet is 3m

So, (applying ar. of sq. =side×side(s))

area of carpet=3m×3m=9m^2

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To find the area of the floor that is not carpeted or (uncarpeted) we will (−) minus the ar. of the floor from ar. of carpet

area which is not carpeted or( uncarpeted ) =20m

2 −9m^2

=11m^2

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Hence, answer Is 11m^2

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