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A person is rock climbing at an altitude of 800 m. He go up by 7 mph. and come down by 9 mph. what was his average speed?

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TCS Other Question
X,Y,Z, W are integers. the expression X-Y-Z is even and the expression Y-Z is odd. if X is even then what must be true??
a)W must be odd.
b) Z must be odd.
c) W must be even.
d)Y-Z must be odd. N is an integer and N>2, at most how many integers among N + 2, N + 3, N + 4, N + 5, N + 6, and N + 7 are prime integers?