Question
What is the permissible concentration of residualÂ
chlorine present in drinking water in mg/L?Solution
Typical levels of free chlorine or residual chlorine present in drinking water are 0.2 - 2.0 mg/L though levels can be as high as 5 mg/L.
A aeroplane covers a distance of 7200 km in 80 hours. What is the speed (in kmph) of the aeroplane?
A person needs to travel 300 km. If he covered the first 30% of the distance at a speed of 60 kmph, then 3/5th of the distance at a speed of 50 kmph, an...
A cyclist goes 30 km at speed x km/h and returns 30 km at speed (x - 5) km/h. Total time taken is 5 hours. Find x.
- A delivery boy travels a certain distance from his warehouse to the customer’s house. At a speed of 15 km/h, he arrives 18 minutes late. But when riding ...
X started to run from point ‘A’ to ‘B’ at a speed of 25 km/hr at 9:00 am and Y started to run from point ‘B’ to ‘A’ at a speed of 15 km/...
X started to run from point ‘A’ to ‘B’ at a speed of 21 km/hr at 9:00 am and Y started to run from point ‘B’ to ‘A’ at a speed of 18 km/...
A thief is spotted by a policeman from a distance of 200 m. When the policeman starts chasing, the thief also starts running. If the speed of the thief ...
One day, 'A' arrived at the bus stop 10 minutes late. The next day, he increased the speed of his bicycle by 5 km/h, which helped him reach the bus stop...
A boy goes to school with a speed of 75 km/h and comes back with a speed of 45 km/h. find his average speed?
A cyclist moves at 25 km/h to reach a checkpoint on time. If the speed is increased to 30 km/h, the cyclist will arrive 12 minute...
Relevant for Exams:
