When the hands of a watch coincide every 64 minutes, how much does it lose per day?
A. 32 8/11 min.
B. 36 5/11 min.
C. 90 min.
D. 96 min.
Answer:A
When the hands of a watch coincide every 64 minutes, how much does it lose per day?
A. 32 8/11 min. B. 36 5/11 min. C. 90 min. D. 96 min.
Explanation: 55 minute spaces are covered in 60 minutes; 60 minute spaces are covered in 60/55 x 60 minutes = 65 5/11 minutes; loss in 64 minutes = (65 5/11 - 64 ) = 16/11 minutes; loss in 24 hours = (16/11x1/64x 24 x 60) minutes = 32 8/11 minutes;