90. A boy walking along a staright line takes 5 steps forward and 3 steps backwards and continues going ahead in this manner. How long will he take to reach the point 6.5 m away from the starting point if his each step is 0.5 m and requires 1s

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steps forward and

3

steps backward, followed again

5

steps forward and

3

steps backward, and so on. Each step is

1 m

long and requires Is. Determine how long the drunkard takes to fall in a pit

13 m

away from the start.

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11 m e t r e s

away from the starting point. The drunkard will fall into the pit after:

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5

steps forward and

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steps backward and so on. Each step is

1 m

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11 m

away from the starting point . The drunkard will fall into the pit after:

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