If the price of an eraser is reduced by 25%, how many erasers can a person buy for 1 rupee?

The sequence 31, 29, 24, 22, 17, ___ follows an alternating subtraction pattern. What is the next number in the sequence?

A man's speed with the current is 20 km/h and the speed of the current is 5 km/h. The man's speed against the current is:

 A train 120 meters long is running with a speed of 60 km/hr. In what time will it pass a boy who is running at 6 km/hr in the direction opposite to that in which the train is going? 

 A small library is started by Prakash and John. Prakash invests Rs. 2000 and John Rs. 5000 for 9 and 7 months respectively. In what ratio will John and Prakash share the profit of Rs. 1100?
 

Gaurav went to the stationers and bought things worth Rs. 25, out of which 30 paise went on sales tax on taxable purchases. If the tax rate was 6%, then what was the cost of the tax-free items?

A well has a depth of 30 meters, and a frog is at the bottom of the well. The frog jumps 3 meters up each day but falls back 2 meters. How many days will it take for the frog to reach the top of the well?

A person riding a bicycle has to cover a distance of 40 km in 5 hours. If the person covers half of the journey in 3/5th of the time, what should be the person's speed in km/h to cover the remaining distance in the time left?

The jogging track in a sports complex is 726 m in circumference. Deepak and his wife start from the same point and walk in opposite directions at 4.5 km/hr and 3.75 km/hr respectively. How long will it take them to meet for the first time?

 Pipe R can empty a full tank in 30 hours. But two pipes P and Q can fill a tank in 15 hours and 10 hours respectively. Ram unknowingly opened all three taps. After 2 hours Shyam realized it and closed Pipe R. Due to this mistake how much time more would it take to fill the tank?