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Bunuel
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Let speed be s
20/50 + 20/s = 2/3
1/5+10/s = 1/3
10/s = 2/15
s=75
Bunuel
A courier van delivers a package from office A to office B. If the van travels the 20 miles between the two offices at 50 miles per hour, how fast must the van travel on the return trip if the roundtrip travel time is to be 40 minutes?

A. 55 mph
B. 60 mph
C. 65 mph
D. 70 mph
E. 75 mph
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