P, Q and R are three towns. The distance between P and Q is 60 km, whereas the distance between P and R is 80 km. Q is in the West of P and R is in the South of P. What is the distance between Q and R?
140 km
130 km
10 km
100 km
Answer is (d). A direct application of Pythagoras theorem. Using Pythagoras theorem – Distance between Q and R = √(〖80〗^2+〖60〗^2 )=√(6400+3600)=√10000=100 km. Ans.(d)
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