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ICSE Class 9 Answered

Questions number 30
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Asked by nandankmj | 04 Jan, 2019, 08:35: PM
answered-by-expert Expert Answer
Let walking speed of Sathish is u km/hr and that of Ashok is v km/hr
 
Both are walking in same direction :
Distance covered by Ashok after 21 hours = 21v km
Distance covered by Sathish after 21 hours = 21u km
 
Given condition : 21u = 21v+21   or u = v+1 ...........................(1)
 
Both are walking towards each other
 since they meet after 3 hours,  3u+3v = 21  or   u+v = 7 ............(2)
 
By solving (1) and (2), we get u = 4 km/hr and v = 3 km/hr
 
Walking speed of Sathish = 4 km/hr  ;  Walking speed of Ashok = 3 km/hr
Answered by Thiyagarajan K | 06 Jan, 2019, 11:13: PM
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