Answer:
Length of the minute hand of the circular clock \[=\text{15 cm}\] \[\Rightarrow \] Radius of the circular clock (r) \[~=\text{15 cm}\] \[\therefore \] Circumference of the circular clock \[\text{= 2 }\!\!\pi\!\!\text{ r = 2 }\!\!\times\!\!\text{ 3}\text{.14 }\!\!\times\!\!\text{ 15cm = 94}\text{.2 cm}\] \[\Rightarrow \] Length moved by the tip of the minute hand in 1 hour \[=\text{94}.\text{2 cm}\] [As the minute hand makes one complete revolution round the clock in 1 hour].
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