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27 Jun 2016, 04:02
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E
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Difficulty:
15%
(low)
Question Stats:
78% (01:19) correct
22%
(02:04)
wrong
based on 102
sessions
History
Date
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Naomi drives to the beauty parlor in 60 minutes. On the way back, her average speed is half the average speed as it was to the way to the parlor. How much time will it take Naomi to travel two round trips to the beauty parlor?
A. 3 hours.
B. 4 hours.
C. 4 hours and 20 minutes.
D. 5 hours and 50 minutes.
E. 6 hours.
A. 3 hours.
B. 4 hours.
C. 4 hours and 20 minutes.
D. 5 hours and 50 minutes.
E. 6 hours.
27 Jun 2016, 06:21
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s1=2s2
since, speed is inversely proportional to time
we have,
s1/s2=2/1=t2/t1
therefore , the time taken for one trip = 60+120 = 180 minutes
total = 180*2 =360 minutes = 6 hours
since, speed is inversely proportional to time
we have,
s1/s2=2/1=t2/t1
therefore , the time taken for one trip = 60+120 = 180 minutes
total = 180*2 =360 minutes = 6 hours
27 Jun 2016, 06:58
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ans : E
from home to parlor
speed V
time 60 min
distance S
We get S=60*V-------(1)
from parlor to home
speed V/2
time t min
distance S
S=t*V/2 -------(2)
from 1 and 2 we get
60+t =S/V + 2S/V
t=3*(S/V) - 60=180 - 60=120
TOTAL TIME FOR TWO ROUND TRIPS :2*(120+ 60) =360 MIN----E
from home to parlor
speed V
time 60 min
distance S
We get S=60*V-------(1)
from parlor to home
speed V/2
time t min
distance S
S=t*V/2 -------(2)
from 1 and 2 we get
60+t =S/V + 2S/V
t=3*(S/V) - 60=180 - 60=120
TOTAL TIME FOR TWO ROUND TRIPS :2*(120+ 60) =360 MIN----E
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