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Question

A 5 m rod is joined with another rod of 4000 mm. What is the new total length of the rod?

A
9 cm
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B
900 mm
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C
0.9 m
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D
900 cm
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Solution

The correct option is D 900 cm
Given:
Initial length of the rod = 5 m
Length of the rod to be joined = 4000 mm
We know that,
1 m = 1000 mm
Thus, 4000 mm = 4 m
Therefore, the final length of rod after joining
= 5 + 4 = 9 m = 9 x 100 cm = 900 cm

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