Question 11
Three boats set off at the same time, each at a constant speed. The speed difference between the first and second equals that between the second and third. The first boat finishes in 36 minutes and the last in 45 minutes. How many minutes does the second boat take?
Editorial note: As intended in the source solution, all three boats cover the same course.
Editorial note: As intended in the source solution, all three boats cover the same course.