Answer with solution please.
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Answer:
a)
Explanation:
distance between them after t hours , using phythagorian theorem
S = ( 100 - 10t )² + ( 10t)²
dS/dt = 20t + 2 ( 100 - 10t )×-10 = 200t - 2000 + 200t = 400t -2000 = 0
t = 2000/400 = 5 hours
answer : choose a)
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