Discussion :: Chain Rule
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An industrial loom weaves 0.128 metres of cloth every second. Approximately, how many seconds will it take for the loom to weave 25 metres of cloth?
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Answer : Option B
Explanation :
Le the required time be x seconds.
More metres, More time (Direct Proportion)
0.128 : 25 :: 1 : x 
0.128x = 25 x 1
x =\(\frac { 25} {0.128} \)=\(\frac { 25*1000 } {128 } \)
x = 195.31.
Required time = 195 sec (approximately).
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