A mobile battery in 1 hour charges to 20 percent.How much time (in minute) will it require more to charge to 30 percent.
Pick one: A) 145 B) 90 C) 175 D) 160 E) 130

Rationale: 1 hr = 20 percent . thus 15 min = 5 percent . now to charge 30 percent 90 min . answer : b
Answer: B