Discussion
If a person walked at 14 km/h instead of 10 km/h, he would have walked 20 km extra. How much distance has he travelled?
Answer: D
He has travelled 50 km.
Let the usual time be t hours. Walking at 14 km/h covers 20 km more than walking at 10 km/h, so 14t − 10t = 20 and t = 5 hours.
\[ \text{distance}=10\times5=50\text{ km} \]
39, 43 and 47 km do not fit these speeds and the 20 km extra.
A check with the answer: walking 50 km at 10 km/h takes 5 hours, and at 14 km/h in 5 hours he would cover 70 km, which is 20 km more. The other distances do not give an extra 20 km in the same time.
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