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# Question 2 (iii) Formulate the following problems as a pair of equations, and hence find their solutions: Roohi travels 300 km to her home partly by train and partly by bus. She takes 4 hours if she travels 60 km by train and remaining by bus. If she travels 100 km by train and the remaining by bus, she takes 10 minutes longer. Find the speed of the train and the bus separately.

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Solution

## Let the speed of train and bus be u km/h and v km/h respectively. According to the given information, 60u+240v=4 ... (i) 100u+200v=256 ... (ii) Putting 1u=p and 1v=q in the equations, we get 60p + 240q = 4 ... (iii) 100p+200q=256 600p + 1200q = 25 ... (iv) Multiplying equation (iii) by 10, we get 600p + 2400q = 40 .... (v) Subtracting equation (iv) from (v), we get; 1200 q = 15 q=151200=180 ... (vi) Putting the value of q in equation (iii), we get 60p + 3 = 4 60p = 1 p=160 p=1u=160 and q=1v=180 u = 60 and v = 80 Hence, speed of train = 60 km/h and speed of bus = 80 km/h  Suggest Corrections  0      Similar questions  Explore more