The time taken by a boat to travel a distance upstream is twice the time taken by it to travel the same distance downstream. What is the speed of the boat upstream if it travels 20 km downstream in 1 hour 40 min ? (in km/h)

To reach Point B at 10 a.m. from Point A, Abhi will have to travel at an average speed of 15 km/h. He will reach point B at 12 p.m., If he travels at an average speed should Abhi travel to reach Point B at 9 a.m.

Fredrick after spending 20% of his monthly salary in buying electronic goods and 10% of the monthly salary in repair work of furniture, invested 30% of the remaining amount in fixed deposits. If he was left with INR 18,963/-, how much is his monthly salary ?

B is 8 years elder to A and B is also 8 years younger to C. 12 years hence, the respective ratio between the ages of A and C will be 5 : 9. What is the sum of present ages of A, B and C

√230÷2.017+58.794=?

Three years ago, Raj’s age was equal to the sum of the present ages of his one son and one daughter. Three years ago, the respective ratio between the ages of his daughter and his son that time was 12;13. If Raj’s wife is 5 years younger to him and her present age is twice the present age of their daughter. What is the present age of their son ? (in years)