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02 Sep 2017, 11:53
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
64% (01:44) correct
36%
(01:39)
wrong
based on 309
sessions
History
Date
Time
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Not Attempted Yet
Mary takes 15 minutes to eat a plate of french fries. Ann takes 30 minutes to eat a plate of french fries. If Mary and Ann decide to eat fries, from the plate, each for a minute alternatively starting with Mary, how long will it take them to finish the plate, if each eats the french fries at her respective rate?
a. 8 mins
b. 10 mins
c. 18 mins
d. 20 mins
e. 45 mins
a. 8 mins
b. 10 mins
c. 18 mins
d. 20 mins
e. 45 mins
02 Sep 2017, 11:54
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Let the total fries in the plate are 30
Mary eats 2 fries per minutes
Ann eats 1 fries per minutes
so in 2 minutes they eat 3 fries.
To eat 30 fries they need 20 minutes
Mary eats 2 fries per minutes
Ann eats 1 fries per minutes
so in 2 minutes they eat 3 fries.
To eat 30 fries they need 20 minutes
Updated on: 03 Sep 2017, 22:14
Originally posted by pushkarajnjadhav on 02 Sep 2017, 12:45.
Last edited by pushkarajnjadhav on 03 Sep 2017, 22:14, edited 1 time in total.
Last edited by pushkarajnjadhav on 03 Sep 2017, 22:14, edited 1 time in total.
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Mary's rate 1/15
Ann's rate 1/30
so in 2 mins they both will eat 1/15+1/30 part of the french fries.
3/30 part of the french fries will be eaten in 2 mins, so in order to complete full plate of french fries, they will need 10 such cycles.
Therefore total time needed = 10*2 = 20 mins
Hence Answer is D.
Kudos if it helps.
Ann's rate 1/30
so in 2 mins they both will eat 1/15+1/30 part of the french fries.
3/30 part of the french fries will be eaten in 2 mins, so in order to complete full plate of french fries, they will need 10 such cycles.
Therefore total time needed = 10*2 = 20 mins
Hence Answer is D.
Kudos if it helps.
