ICSE Class 7 Answered

A man walked 3 hours at a speed of 6 km/hr and 4 hours at a speed of 8 km/hr. Find his average speed for the whole journey.

Asked by Topperlearning User | 19 Sep, 2016, 10:36: AM

Expert Answer

$Distance space covered space at space 6 space km divided by hr space in space 3 space hours space equals space 6 cross times 3 space equals space 18 space km. Distance space covered space at space 8 space km divided by hr space in space 4 space hours space equals space 8 cross times 4 space equals space 32 space km. Total space distance space covered space equals space 18 space plus space 32 space equals space 50 space km Total space time space taken space equals space 3 space hours space plus space 4 space hours space equals space 7 space hours therefore space Average space speed space equals space fraction numerator Total space distance over denominator Total space time end fraction equals 50 over 7 equals 7.14 space km divided by hr The space average space speed space of space the space whole space journey space is space 7.14 space km divided by hr.$

Answered by | 19 Sep, 2016, 12:36: PM

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