单选题 A digital wristwatch was set accurately at 8:30 a.m. and then lost 2 seconds every 5 minutes. What time was indicated on the watch at 6:30 p.m. of the same day if the watch operated continuously until that time?

【正确答案】 E
【答案解析】[解析] 从上午8点半到下午6点半，共经过了10个小时，所以根据题意可求出该手表在这10个小时中所慢的时间为：(10×60)÷5×2=240秒，该手表在10个小时内慢了4分钟，所以在下午6点半时，该手表上的时间是6点26分。