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ICSE Class 10 Answered

  • If the speed of the car is increased by 10km per hr,it takes 18 minutes less to cover a distance of 36 km.Find the speed of car
Asked by sukhmansohitsingh0565 | 19 Oct, 2019, 10:56: PM
Expert Answer
let space the space speed space be space straight x
distance space equals space 36 km
time space equals space 36 over straight x
on space increasing space speed space to space straight x space plus 10
straight t equals fraction numerator 36 over denominator straight x plus 10 end fraction
difference equals 18 over 30 space hrs
36 over straight x minus fraction numerator 36 over denominator straight x plus 10 end fraction equals 18 over 30 space
simplfying space we space get
straight x squared plus 10 straight x minus 1200 equals 0
straight x equals 30 space or space straight x equals negative 40
so space straight x space equals 30
speed space of space car space equals space 30 km divided by hr
Answered by Arun | 20 Oct, 2019, 01:55: PM
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