Clocks

Number Theory Level 1

When Bruno arrived at the school, he saw that one of the clocks in his classroom was marking 6:50 am and 7:10 am the other.

The teacher has warned that one of the clocks have 3 minutes late and the other was early.

How many minutes the other clock was early?

7 10 13 17

Victor Paes Plinio by Victor Paes Plinio , 21, Brazil

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2 solutions

Sameh Rehan
Apr 23, 2014

readings: 6:50 and 7:10. one is late by 3 mins, therefore 6:50 is late and the correct time is 6:53. The 7:10 is advanced by 7+10=17 mins.

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S W
Apr 21, 2014

The clock showed 7:10 AM is three minutes late, that's mean original time is 7:07 AM and the clock early is have 20 Minutes difference with 3 minutes late clock so (20-3)= 17 minutes

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