Question

a plane left 30 minutes late then his schedule time in order to reach the destination 1500 km away in time it is increase in speed by 100 km per hour from the usual speed find its usual speed

Answer 1

Heya,
Friend,

Hope this will help you.... :)

Answer 2

1500/x-1500/x(x+100)=1/2
1500x+150000-1500x/x(x+100)=1/2
150000*2=x(x+100)
300000=x2+100x
b2-4ac=10000-4*1*-300000
=10000+1200000
1210000
using quadratic eqn we can find x
x=500