While doing final location survey, the centre line is fully marked with pegs at --- metre distance (a) 10m (b) 20m* (c) 30m (d) 50m

While doing final location survey, the centre line is fully marked with pegs at --- metre
distance
(a) 10m
(b) 20m*
(c) 30m
(d) 50m
by

1 Answer

Answer :

(b) 20m*
by

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A,B are start walking around a Circular park of radius 70m. They start at the same point, and A goes clockwise at 10m/s, while b goes anti-clockwise at 20m/s.How many times will they cross each other at the starting point if they walk for 30 minutes? a) 20 b) 40 c) 60 d) 80 e) None of the above

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Last Answer : Radius = 70m, So circumference = 2 (22/7) 70 =440m Relative speed = 10 +20 = 30m/s They will meet everytime at the starting point when the distance covered by both put together is a multiple of 440 ... =1800/44 =40.9 So they will meet 40 times (we need to ignore the decimal part). Answer : b

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