Comprehension Passage
Direction: Eight cities P through W. They are connected with one-way roads which are from P to Q, P to S, Q to R, Q to T, R to U, S to T, S to V, W to T, T to U and V to W. Each road is 20 km length.
How many routes are there to reach city U from city S without crossing city P ?
1
4
2
5
3
3
4
2