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Stoplight A changes color every 42 seconds and Stoplight B changes color every 30 seconds. Both stoplights changed color 10 seconds ago. After how many seconds will the stoplights change color at the same
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Stoplight A changes color every 42 seconds and Stoplight B changes color every 30 seconds. Both stoplights changed color 10 seconds ago. After how many seconds will the stoplights change color at the same time again *

200
190
210
180

User Bucabay
by
7.4k points

1 Answer

5 votes

Answer:

210

Explanation:

LCM of 42sec and 30 sec=210 sec

User Rob King
by
8.1k points
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