Question

16. Two roads cross at right angles at 0.A person A
walking along one of them at 3 m/s sees another
person B walking at 4 m/s along the other road
at 0, when he is 10 m off. They are nearest to
each other when A has walked a dist.
1) 1.8 m
2) 2.0 m
3) 3.0 m
4) 3.6 m
​

Answer 1

Answer:

correct answer is 8m

Explanation:

x  

2

=(10−3t)  

2

+4t  

2

 

x=[(5t−6)  

2

+64]  

2

1

​  

 

 

for x to be least

(5t−6)=0⟹t=1.2s, x=8m

Answer 2

Answer:3.6m

Explanation: