From the given diagram ,
Let the toll charged at junctions A, B, C and D be a, b, c and d respectively.
Then 1st we will list down all the routes and corresponding cost of travel.
Since the cost of travel including toll on routes S-A-T, S-B-C-T, S-B-A-T and S-D-C-T is the same. And D-T has no traffic due to high toll charge at D.
From the last solutions we will get b = 5, 14 + a = 7 + b + c = 12 + c, or a + 2 = c 7 + b + c = 10 + c + d = 12 + c or d = 2, hence the result is B = 5, d = 2 and c-a = 2 that is satisfied by option (E).
F
Except option (c) rest all are perfect squares.
Except, `Plate', all two in number.
All other terms are used to denote the size.
15/20 x 5/4 x 2/3 x 8/5 = 1
All Except `Raft' are down by animal.
Only '729' is a perfect cube.
This is the only prime number in the group.
All others are soild metals.
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