Discussion
Two men A and B start from place X walking at 4 ½ kmph and 5 ¾ kmph respectively. How many km apart they are at the end of 3 ½ hours if they are walking in the same direction?
Answer: C
Walking the same way, the gap grows at the difference of their speeds.
\[ 5\tfrac{3}{4} - 4\tfrac{1}{2} = 1.25 \text{ kmph} \]
\[ 1.25 \times 3.5 = 4.375 = 4\tfrac{3}{8} \text{ km} \]
Had they walked in opposite directions the gap would grow at the sum, 10.25 kmph, giving \( 35\tfrac{7}{8} \) km - which is the last option.
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