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Questions  >>  Olympiad-Math  >>  Class 4

John ran 1 block in 30 seconds and for second block he took 50 seconds. He ran 10 blocks in total. How much time he took to run all 10 blocks in total if he ran with the same pattern?

$\begin{array}{11} (a)\; \text{5 minutes} \\ (b)\; \text{6 minutes 40 seconds} \\ (c)\; \text{6 minutes 30 seconds} \\ (d)\; \text{5 minutes 40 seconds} \end{array}$

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