At a certain time, Janice notices that her digital watch reads a minutes after two o'clock. Fifteen minutes later, it reads b minutes after three...

At a certain time, Janice notices that her digital watch reads a minutes after two o’clock. Fifteenminutes later, it reads b minutes after three o’clock. She is amused to note that a is six times greater thanb. What time was it when she looked at her watch for the second time? (Source: Mandelbrot)