How Far Is 75km – Example 4 A train runs at a speed of 75 km/h. (i) How far will it travel in 20 minutes? So the train is moving at a constant speed of 75 km/hour 1 hour by train = distance 75 km i.e. distance covered by train in 60 minutes = 75 km We need to find distance of train in 60 minutes train journey x km. So our table now looks like that because As the distance increases, the travel time is also proportional. 75/60 = 𝑥/20 75/60 × 20 = 𝑥 75/3 = 𝑥 25 = 𝑥 𝑥 = 25 km ∴ The train will run 25 km Example 4 A train runs at a speed of 75 km per hour. (ii) Find the time required to cover a distance of 250 km. We need to find the time required to cover a distance of 250 km, so that the time required is y minutes. So our table looks like direct distance and time 75/60 = 250 / 𝑦 75 × y = 60 × 250 𝑦 = (60 × 250) / 75 𝑦 = (4 × 250) / 5 𝑦 = (4 × 50 ) / 1 𝑦 = 200 minutes Convert hours 𝑦 = 200/60 hours 𝑦 = 3 hours 20 minutes The train takes 3 hours 20 minutes
Dawneet Singh did his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching since last 13 years. It offers courses in mathematics, science, social science, physics, chemistry, and computer science.
How Far Is 75km
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