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Asked by adv.mukulsrivastava | 15 May, 2019, 10:08: AM
answered-by-expert Expert Answer
We know, 
 
Average speed = Total distance/ total time taken 
Total time required to complete the 200 km journey is 
t = 200/ 60 = 20/6 hour
 
The first 50 km distance is completed with a speed of 40 km/h 
Thus, time taken to complete 50 km distance is,
t = 50/40 = 5/4 hour
 
Thus the remaining journey of 150 km must be completed in
 
equals space 20 over 6 minus 5 over 4 space equals 25 over 12 space h o u r s
 
Thus, to maintain the average speed of 60 km/h for whole journey the distance of 150 km must be completed with 
speed of,
 
s space equals fraction numerator 150 over denominator begin display style bevelled 25 over 12 end style end fraction space equals space fraction numerator 150 space cross times space 12 over denominator 25 end fraction space equals space 72 space k m divided by h 
 
 
 
Answered by Shiwani Sawant | 15 May, 2019, 11:24: AM

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