1.

The height of three towers are in the ratio of 5:6:7. If a spider takes 15 minutes to climb the smallest tower, how much time it will take to climb the highest one 1. 15 minutes 2. 18 minutes3. 21 minutes4. 54 minutes

Answer»

Correct option is (3) 21 minutes

Let height of towers, be 5x, 6x, 7x meter respectively

∴ Speed of spider = \(\frac{5x}{15}m/min\)

∴ Time taken to climb the highest one = \(\cfrac{7x}{\frac{5x}{15}}\)

 = \(\frac{7x\times15}{5x}\) = 21 min



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