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1). \(\;\frac{{1800}}{{63}}\;km/h\)2).3).4). |
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Answer» LET, the total distance travelled by train be ‘x’ km. ⇒ Time taken to travel one fourth part $(= \frac{{\frac{x}{4}}}{{50}} = \frac{x}{{200}})$ ⇒ Time taken to travel one third part $( = \frac{{x/3}}{{60}} = \frac{x}{{180}})$ ⇒ Time taken to travel rest part (5/12) $( = \frac{{\frac{{5x}}{{12}}}}{{100}} = \frac{x}{{240}})$ ∴ Total time taken in the journey =$(\frac{{53\;x\;}}{{3600}})$ Average speed of the whole journey = total distance/total time $(= \frac{x}{{\frac{{53x}}{{3600}}}}\; = \frac{{3600}}{{53}}\;\;{\rm{km}}/{\rm{h}})$ |
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