CAT Exam Numerical Ability

what is the value of (-3/7)^-4
a, 81/2401
b, 2401/81
c, 18/2401
d, 81/2410

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CAT Other Question

p(A)=1/3;
p(B)=1/2
p(A ᴖB)=1/4;
p(A’ᴗB’)= ?
plz solve this with explanation,,
TWO buses start from the same time from delhi and agra.which are 300kn apart,towards each other.after what time if they cross each other if their speeds are 38km/hr and 37km/hr?