Chain Rule Q15

15. 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?

[A] 178

[C] 204

[B] 195

[D] 488

Answer : B

Explanation :

Let the required time be x seconds. Then, More metres, more time ( Direct Proportion)

0.128 : 25 :: 1 : x

0.128 x x = 25 x 1

x = 25 0.128 25 x 1000 128

x = 195.31

Required time = 195 sec (approximately)