Problema Solution
A train takes half an hour less to cover a distance of 440km if it's usual speed is increased by 8km/hr. Find the usual speed of that train.
Answer provided by our tutors
TS=440
(T-1/2)(S+)=440
440+8T -220/T -4 =440
8T -220/T-4=0
8T^2-4T -220=0
2T62-T-55=0
(2T-11)(T+5)=0
T =11/2 OR T=-5
T IS +VE
T=11/2 HOUR
S=440*2/11=80KM/HR
TIME =11/2 HOUR =5.5 HOUR
SPEED=80KM/HR