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A car covers 75 km of its journey at60 km/hr, the next 45 km at a speed of 30km/hr and the remaining part of the journey in 2 firs and 15 min. If the aver-age speed for the journey was 45 km/hr, how muchdistance was covered in the last part of the journey?a) 100 km c) 80 kmb) 90 km d] 180 km |
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Answer» Answer: Let the TOTAL distance TRAVELLED be x KM Then total time taken = 10 x/3
+ 20 x/3
+ 60 x/3
= 30 x
+ 60 x
+ 180 x
= 180 6x+3x+x
= 180 10x
= x
hrs Then AVERAGE speed = = Totaltimetaken Totaldistancetravelled
= x/18 x
km/hr = 18 km/hr |
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