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
Growing of two or more crops simultaneously intermingled without any specific row pattern is known as:
Button mushroom belongs to the genus
Disorders like Hollow Stem of Cauliflower; Browning of Cauliflower ; Top sickness of Tobacco is caused due to the deficiency of
Application developed by Indian institute of wheat and barley research for pest management in wheat crop is
Which crop is sensitive both to drought and excessive moisture condition?
Which one of the following stain is used for staining of the nematodes?
Gurgaon project was started by
Land holding of medium farmer is
Tristeza is the viral disease of citrus which is particularly transmitted by which of the following:
Which one is not related with 4-H club?
