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ICSE Class 10 Answered

A plane travels a distance of 1200 km at a certain speed. But on the return trip its speed was increased by 80 km/hr and hence it took 30 minutes less than the onward journey. Find the original speed.
Asked by khushdab | 03 Apr, 2020, 02:33: PM
answered-by-expert Expert Answer
begin mathsize 14px style let space the space original space speed space be space straight x space km divided by hr time space taken space equals 1200 over straight x space hrs return space speed space equals space straight x space plus 80 space km divided by hr time space taken equals fraction numerator 1200 over denominator straight x plus 80 end fraction space hrs by space given space condition 1200 over straight x minus fraction numerator 1200 over denominator straight x plus 80 end fraction equals 30 over 60 solving space we space get straight x equals 400 space km divided by hr end style
Answered by Arun | 03 Apr, 2020, 09:26: PM

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