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ICSE Class 7 Answered

A train covers a distance of 670 km in 6 h 5 min. If it covers the first 390 km of the journey at 90 km/h, find its speed for the whole journey
Asked by lakshmipalaparthi1990 | 23 Oct, 2023, 08:10: PM
answered-by-expert Expert Answer
Time space taken space for space 670 space km space equals space 6 space hr space 5 space min space equals space open parentheses 6 plus 5 over 60 close parentheses space hrs equals 73 over 12 hrs Speed space for space 390 space km space equals space 90 km divided by hr Time space for space 390 space km space equals space Distance over Speed equals 390 over 90 equals 13 over 3 hrs Distance space left space equals space 670 space minus space 390 space equals space 280 space km Time space equals space 73 over 12 minus 13 over 3 equals 7 over 4 hrs Speed space equals space fraction numerator 280 over denominator 7 over 4 end fraction equals 160 space km divided by hr
Answered by Rashmi Khot | 25 Oct, 2023, 10:30: AM

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