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28 Mar 2017, 02:50
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C
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84% (01:33) correct
16%
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A motorcycle messenger leaves his home base and travels at 40 miles an hour to make a delivery 20 miles away. If the messenger wishes to be back at his home base 50 minutes after he left it, then how fast must he travel on his return trip?
A. 24 miles per hour
B. 45 miles per hour
C. 60 miles per hour
D. 90 miles per hour
E. 120 miles per hour
A. 24 miles per hour
B. 45 miles per hour
C. 60 miles per hour
D. 90 miles per hour
E. 120 miles per hour
28 Mar 2017, 03:06
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he travels 20 miles at 40 mph so,, time consumed = 30 mins..
on his way back he has 20 mins left, so he should travel by 60 mph on his way back
Ans C
on his way back he has 20 mins left, so he should travel by 60 mph on his way back
Ans C
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28 Mar 2017, 03:31
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Bunuel
A motorcycle messenger leaves his home base and travels at 40 miles an hour to make a delivery 20 miles away. If the messenger wishes to be back at his home base 50 minutes after he left it, then how fast must he travel on his return trip?
A. 24 miles per hour
B. 45 miles per hour
D. 60 miles per hour
D. 90 miles per hour
E. 120 miles per hour
A. 24 miles per hour
B. 45 miles per hour
D. 60 miles per hour
D. 90 miles per hour
E. 120 miles per hour
Bunuel : just a minor correction (highlighted part). It should be C instead of D.
initial speed = 40 mph
distance = 20 m
time taken = 20/40 = 1/2 hour = 30 mins
time remaining = 50-30 =20 mins = 1/3 hour
new speed = 20/(1/3) = 60 mph
Hence option C is correct
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