Two roads XY and YZ of 15 metres and 20 metres length respec

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Two roads XY and YZ of 15 metres and 20 metres length respectively are perpendicular to each other. What is the distance between X and Z by the shortest route?

[DSSSB TGT 2014 (Mathematics)]

A 35 metres

B 30 metres

C 24 metres

D 25 metres