A man goes by motor boat a certain distance upstream at 15 km/hr and return the same downstream at 20 kin/hr. The total time taken for the journey was 7 hrs. Find how far did he go.
Correct Answer: Description for Correct answer:
\( \Large \frac{d}{20}+\frac{d}{15}=7 \)
Therefore, d = 60 km
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