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ICSE Class 9 Answered

the delhi metro train coverage a dstance of 42 km in 80 min. what is average speed of a train km/h as wel as in m/s
Asked by ayushnsehi16 | 18 Aug, 2018, 08:07: PM
answered-by-expert Expert Answer
speed = distance / time = begin mathsize 12px style fraction numerator 42 space k m over denominator 80 space m i n end fraction cross times fraction numerator 60 space m i n over denominator 1 space h o u r end fraction equals space 31.5 space fraction numerator k m over denominator h r end fraction end style
18 km/hr = 5m/s
 
hence speed in m/s = begin mathsize 12px style 31.5 space fraction numerator k m over denominator h r end fraction cross times space 5 over 18 fraction numerator begin display style bevelled m over s end style over denominator begin display style bevelled fraction numerator k m over denominator h r end fraction end style end fraction space equals space 8.75 space m over s end style
Answered by Thiyagarajan K | 19 Aug, 2018, 11:42: AM
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