Question

train travels 1200km with uniform speed. If its speed is increased by 20km/hr, it will take 5hours less to cover the same distance. Find the initial speed of the train.​

Answer 1

120km/hr is the answer

Step-by-step explanation:

first divide 1200 with 1000 and multiply the answer with 10 you will get 120 I'm/hr

Answer 2

Answer:

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Let the speed of the car be s and time be t

Then, st=240

⟹s=t240

and (s+20)(t−2)=240

(t240+20)(t−2)=240

(20t+240)(t−2)=240t

20t2+240t−480−40t=240t

20t2−40t−480=0

t2−2t−24=0

t2−6t+4t−24=0

(t−6)(t+4)=0

t=−4,6

Hence, time is 6 hr

and speed =6240=40km/hr