There are two clocks, both set to show 10 pm on 21st January 2010. One clock gains 2 minutes in an hour and the other clock loses 5 minutes in an hour. Then by how many minutes do the two clocks differ at 4 pm on 22nd January 2010? [DMRC—Customer Relationship Assistant (CRA) Exam, 2016]
(a)126 minutes
(b)136 minutes
(c)96 minutes
(d)106 minutes
Answer
Answer (as printed): A
Explanation
One clock show 10pm. On 21st January 2010 One clock gains = 2 minutes Other clock loses = 5 minutes Time period between 10 pm and 4 pm = 18 hours ∴ Required difference = (2 × 18 + 5 × 18) minutes = 126 minutes
Explanation as extracted from the printed page; notation may be imperfect.