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According to the question, Required time = 75/(10 + 5) + 75/(20 – 5) => 75/15 + 75/15 => 5 + 5 = 10 hours
What is the sum of ages of persons whose ages are multiple of 5?
How many such pairs of letter are there in the word LEVERAGE, each of which has as many letters between them in the word as in the English alphabet?