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Mathematics · Q1401:12

A can finish a job in 30 days and B in 30 days. Working together, how long will they take?

  • A12 days
  • B15 days
  • C18 days
  • D20 days
Why: Combined rate is 1/30 + 1/30 = 1/15, so 15 days.
  1. 01

    Learn the rule, then drill it

    Short lessons break each topic into rules. Check yourself on every rule before you move on.

  2. 02

    Mocks that feel like the paper

    Sit timed, full-length papers, then see exactly where the marks went.

  3. 03

    Revision that finds you

    Missed questions come back when you're about to forget them, not when you remember to look.