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P and Q are 27 km away. Two trains with speed of 24 km/hr and 18 km/hr respectively start simultaneously from P and Q and travel in the same direction. They meet at a point R beyond Q. Distance QR is
Answer & Solution
Correct Answer:
Option
B
Relative speed = 24 - 18 = 6 km/hr
Time required by faster train to overtake slower train $$ = \frac{{27}}{6} = 4\frac{1}{2}{\text{ hr}}$$
$$\therefore $$ Distance between Q and R $$ = 18 \times 4\frac{1}{2} = 81{\text{ km}}$$
Time required by faster train to overtake slower train $$ = \frac{{27}}{6} = 4\frac{1}{2}{\text{ hr}}$$
$$\therefore $$ Distance between Q and R $$ = 18 \times 4\frac{1}{2} = 81{\text{ km}}$$
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