Question
A train travels 240 km at a uniform speed. If the speed
of the train is increased by 20 km/h, it takes 1 hour less to cover the same distance. What is the original speed of the train?Solution
Solution: Let the original speed be x km/h. Time taken at original speed = 240/x hours. Time taken at increased speed = 240/(x + 20) hours. According to the problem: 240/x - 240/(x + 20) = 1. Cross-multiplying and simplifying gives: 240(x + 20) - 240x = x(x + 20) => 240 * 20 = x^2 + 20x => x^2 + 20x - 4800 = 0. Using the quadratic formula: x = [-20 ± √(20^2 + 4 * 4800)] / 2 x = 60 km/h. Correct answer: A) 60 km/h
Which of the following was one of the impact of Swadeshi movement in the communication system of India?
Consider the given statements with respect to the creation of Great Britain. Which of the statements are correct?
Statements:
First Spices Park of Rajasthan was established at -
Forest research Institute of India is situated in?
- What is the largest river in the world by volume?
Select the option that shows the correct arrangement of the given words in the order in which they appear in the English dictionary.Â
1. Feather...
Who organized second Buddhist council?
Select the option that shows the correct arrangement of the given words in the order in which they appear in the English dictionary.Â
1. Desert<...
Which pair is not correctly matched?
Which part of the atom emits the radioactive radiation?
