CAT Exam

Given a sequence of six strictly increasing positive integers such that each number (besides the first) is a multiple of the one before it and the sum of all six numbers is 79, what is the largest number in the sequence?

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CAT Other Question

A, B and C start from the same place and travel in the same direction at the speeds of 30, 40 and 60 km per hour respectively. B starts two hours after A. If B and C overtake A at the same instant, how many hours after A did C start? What is the sum of all positive two-digit integers that are divisible by each of their digits.
A)690 B)630 C)480 D)520 E)590