TCS Company Numerical Ability Averages

Person travels to a hill, if he goes from A to B with speed of 4kmph and returns back to B with speed of 5kmph. What is his average speed of journey?

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TCS Other Question

55th word of SHUVANK in dictionary?? How many two-digit numbers are there which, when subtracted from the number formed by reversing its digits as well as when added to the number formed by reversing its digits, result in a perfect square?
option
a) 1
b) 2
c) 3
d) 4