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Re: Riders board the Jelly Coaster in groups of 4 every 15 secon [#permalink]
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Explanation

To find Kurt’s wait time, determine how long it will take for 200 people to board the Jelly Coaster. The problem states that 4 people board every 15 seconds. Since there are four 15-second periods in one minute, this rate converts to 16 people per minute. To find the time, divide the “work” (the people) by this rate:

200 people ÷ 16 people per minute = 200 ÷ 16 = 12.5 minutes.

The question asks for an approximation, and the closest answer is (D). In theory there may be an additional 15 seconds while Kurt’s group is boarding (the problem doesn’t really say), but Kurt’s total wait time would still be approximately 13 minutes.
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Riders board the Jelly Coaster in groups of 4 every 15 secon [#permalink]
total groups = 200/4 = 50

1 group takes 15 seconds
50 groups will take 15*50 = 750 seconds = 12.5 minutes = 13 minutes (D)
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Riders board the Jelly Coaster in groups of 4 every 15 secon [#permalink]
lucifer6251
please explain in detail how you got this part "4 members for 15 seconds i.e. for 60 sec 16 members will be boarded.
"
that is how did you get 16 members please elaborate
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Re: Riders board the Jelly Coaster in groups of 4 every 15 secon [#permalink]
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saad wrote:
lucifer6251
please explain in detail how you got this part "4 members for 15 seconds i.e. for 60 sec 16 members will be boarded.
"
that is how did you get 16 members please elaborate



Groups of 4, means that 1 group has 4 people.
Then, how many groups are there if there are 200 people?
= 200/4 = 50 groups

I don't think I have mentioned '16' anywhere.
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