In the following question, the sentence given with blank to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.
It is ______ for all the students to follow the rules.
A beedi making workshop can hire 5 women by paying them Rs. 300 per day. The 6th woman demands Rs. 350 per day. If this woman is hired then all other women must be paid Rs. 350. The marginal resource (labour) cost of the 6th woman is
A boat goes 15 km upstream and 10 1/2 km down stream in 3 hrs 15 min. It goes 12 km upstream and 14 km downstream in 3 hrs. What is the speed of the boat in still water?