Question
A man travels 450 km to his home partly by train and
partly by car. He takes 8 hrs 40 minutes if he travels 240 km by train and rest by car. He takes 20 minutes more if he travels 180 km by train and the rest by car. The speed of the car in km/hr isSolution
Let the speed of train and car be a km/hr and b km/hr. According to the question ⇒ 240/a + 210/b = 8 hr + 40 min ⇒ 240/a + 210/b = ⇒ 240/a + 210/b = 26/3 ---(1) ⇒ 180/a + 270/b = 9 ---(2) Multiply by 3 in equation (1) and by 4 in equation (2) ⇒ 450/b = 10 ⇒ b = 45 km/hr Speed of car is 45 km/hr
A shopkeeper marks an article 30% above its cost price and gives a discount of 10% on the marked price. What is the profit percentage?
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