A postman was returning to the post office which was in front of him to the North. When the post office was 100 m away from him, he turned to the left and moved 50 m to deliver the last letter at Shanti Villa. He, then moved in the same direction for 40 m, turned to his right and moved 100 m. How many metres was he away from the post office?

Options

A. 0
B. 90
C. 150
D. 100

Answer

B

Explanation

The journey of the postman is as shown in Fig.
i.e. P to Q, Q to.R, R to S, and S to T.
P = Starting Point
T = End Point

Therefore, at the end point, the distance of Postman from post office
`=TP = QS = (QS + RS) = (50 + 40) m = 90 m `