Question

9. Lampposts are placed 30 metres apart along a road. How long wal a car travelling at 45 km per hour take to pass 6 lamp-posts, not counting the first of them?
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Answer 1

Step-by-step explanation:

lamp posts are 30m apart

so car needs to travel 180 m to pass 6 lampposts .

speed of car is 45kmph thqt 9s 25/2 m/s .

time = distance by speed = 180 / 25/2 = 360 / 25 = 14.4

Answer 2

Step-by-step explanation:

45km =45000m

m/s =45*5/18

=12.5m/s

distance covered =5*30=150

time taken =150*10/125

=12second