The Ant

Level pending

In a hollow cuboidal box is an ant , which can crawl on the horizontal bottom with a speed of v = 1 cm/s , on vertical faces with a speed of u = 0.75 cm/s but cannot crawl on the ceiling . If the horizontal bottom of the box is l = 20 cm long and b = 12 cm wide and vertical faces are h = 12 cm high , what minimum time would the ant take to crawl from a corner to another diagonally opposite corner ?

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