question_answer

Shashi is decided fixed distance to walk on a tread mill. First day, she walks at a certain speed. Next day, she increases the speed of the tread mill by \[\text{1 km}/\text{h},\]she takes 6 min Less and if she reduces the speed by \[\text{1 km}/\text{h},\]then she takes 9 min more. What is the distance that she has decided to walk everyday?

A) 4 km

B) 6 km

C) 5 km

D) 3 km