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19. A car travels 25 km an hour faster than abus a takes 10 hours less journey of 500,kms. The speed of the car and bus aregiven by respectively. |
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Answer» a car travels 25 kilometre and hours faster Naina bus takes 10 hours journey of 500 km the speed of the car in the bus are given by respectively?...Sol.. in my next answet till then select this as best and like..please let speed of bus = x km/hrcar speed= x+25 km/hrtime= dist/speedbus time= 500/x hrcar time= 500/x+25 hrA/S500/x - 500/x+25= 10500(x+25-x/x(x+25)}=10500×25/x^2+25x=10x^2+25x=1250x^2+25x-1250=0x^2+50x-25x-1250=0x(x+50)-25(x+50)=0(x+50)(x-25)=0either x+50=0 , x= -50 (neglected because speed not be in -ve)or x-25=0 , x=25so speed of bus= 25 km/hrspeed of car = 50 km/hr |
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