Fluoride in small quantity protects the teeth but in high quantity it causes fluorosis which deforms the teeth.
A man travelled a total distance of 300 km. He travelled first 100 km on car with a speed of 20 km/h and rest of the distance on bike whose speed is 10 ...
The speed of two cars A and B are in the ratio of 15:19 respectively. Car A travels 16 km less than the car B in the same time duration. What was the di...
The sum and difference of the speeds of the two cars are 70km/h and 30km/h respectively. In a race, if the car with more speed finishes 6 minutes earlie...
A boat can go 3 km upstream and 5 km downstream in 55 minutes. It can also go 4 km upstream and 9 km downstream in 1 hour 25 minutes. In how much time (...
In a 1500-metre race, 'Sahil' beats 'Rohan' by '300' metres and 'Kabir' by '450' metres. If 'Rohan' and 'Kabir' participate in a 700-metre race, and 'Ka...
Two cars X and Y start from two places A and B respectively which are 700 km apart at 9 a.m. Both the cars run at an average speed of 60 km/hr towards e...
A person travels a certain distance at 8 km/hr and reaches 1 hr 30 minutes late. If he travels at 10 km/hr, he reaches 1 hr 30 minutes earlier. The dist...
A car covers a certain distance at the speed of 30 km/h and comes back at the speed of 20 km/h. What is the average speed of the car for the entire jour...
It takes 12 hours less to travel from point 'C' to point 'D' at a speed of 50 km/h than it takes to travel the same distance at 20 km/h. If 50% of the d...
Train ‘A’ running at a speed of 19.8 km/hr. can cross a standing goods train 4 times its length in 40 seconds. Find the time taken by 300 meters lon...
