Q1 · hard · AI-verified
In a mixture of 80 liters, the ratio of milk to water is 7:1. How much water should be added to make the ratio of milk to water 7:3?
- 20 liters
- 30 liters
- 25 liters
- 15 liters
Q2 · hard · AI-verified
A person can row downstream 40 km in 4 hours and upstream 30 km in 6 hours. Find the speed of the person in still water.
- 7.5 km/hr
- 8 km/hr
- 6.5 km/hr
- 7 km/hr
Q3 · hard · AI-verified
A cylindrical tank has a radius of 7m and height of 10m. If it is filled at the rate of 22 cubic meters per minute, how long will it take to fill 3/4th of the tank?
- 52.5 minutes
- 60.0 minutes
- 45.5 minutes
- 48.3 minutes
Q4 · hard · AI-verified
The sum of squares of three consecutive natural numbers is 365. Find the middle number.
- 11
- 10
- 12
- 9
Q5 · hard · AI-verified
Two trains of lengths 240m and 160m are running in opposite directions at speeds of 72 km/hr and 54 km/hr respectively. How much time will they take to completely cross each other?
- 10.28 seconds
- 11.43 seconds
- 9.86 seconds
- 12.57 seconds