If takes 25.5 minutes to download a file using Modem A. Modem B work at 17% of the speed of Modem A. How long does it take to download a file using a Modem B?  Choose the correct choice from the following answers.
A) 130 minutes	B) 140 minutes	C) 150 minutes	D) 160 minutes	E) 170 minutes

Rationale: let speed of modem a be k so speed of modem b is 17 / 100 * k time taken by modem a = 25.5 minutes let time taken by modem b = x k * 25.5 = 17 / 100 * k * x 0.17 * x = 25.5 x = 25.5 / 0.17 = 150 minutes answer : c
Answer: C