9. C wants to see all eight directions, he travels clockwise and he moves from one direction to other every 10 seconds. C starts his journey from South. He covered five directions and he realizes he missed to see west in detail. So he goes to West in the anti-clockwise direction and returns back to North-East. How many seconds it took for him to complete the total ourney?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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