Discussion
Radha walks 3 km 725 m per day on Monday, Wednesday and Friday, whereas she walks 2 km 9 m per day on Tuesday and Thursday. Total distance covered by her from Monday to Friday is :
Answer: B
The total distance is 15.193 km.
Write each distance in kilometres with three decimal places (1 km = 1000 m): 3 km 725 m = 3.725 km and 2 km 9 m = 2.009 km. She walks the first on three days and the second on two:
\[ \begin{aligned} 3 \times 3.725 &= 11.175 \\ 2 \times 2.009 &= 4.018 \\ 11.175 + 4.018 &= 15.193\ \text{km} \end{aligned} \]
The usual slip is writing 9 m as 0.9 km or 0.09 km instead of 0.009 km, which inflates the total and leads to the larger options.
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