After measuring 120 metres of a rope, it was discovered that the metre rod was 3 cm longer. The true length of the rope measured is:

a) 116m 40 cm

b)121 m 20 cm

c)123 m

d) 123m 60 cm

Pls. explain the answer.

Answer :

Meter rod is 3 cm longer , so , to measure 120 m , our rod is apply by 120 times , So

Total length that is measure by longer part  =  120 × 3  =  360 cm  =  3.60 cm  ( As we know 1 m =  100 cm )

So,

Actual length of rope  =  120 m  +  3.6 m  =  123 m 60 cm 

So,

Option ( D )  ( Ans )

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