Pls answer he 10th sum
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Can't see the sum........
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Answer:
Step-by-step explanation:
Speed of thief = 100m/ min
Assumed that km is written by mistake
Let sat after t minute police catch thief
Distance covered by thief = 100×(t+1)
Distance covered by police
= 100 + (100+10) + (100+20)+ .......+(100+10(t-1)
a = 100 n = t d = 10
L = a + (t-1)d = 100+(t-1)10 = 90+10t
Sum = (n/2)(a + L)
= (t/2)(100 + 90 +10t)
=(t/2)(190 +10t)
= t (95 +5t)
5t^2 + 95t = 100t + 100
5t^2 -5t -100=0
t^2 - t - 20 =0
t^2 -5t +4t -20 = 0
(t-5)(t+4) = 0
t = 5 min
If i assume km was written correct
Then distance covered by thief = 100*×1000(t+1) m
So
5t^2 + 95t = 100000t + 100000
5t^2 - 99905t - 100000 = 0
t^2-19981-20000=0
By solving this we can get time.
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