Question

12)
Some part of a journey of 780 km was made by
car with a speed of 60 km/hr and the remaining
journey was made by train with a speed of 100 km/
hr. if total time required was 9 hr find the time
taken by by train and distance covered by the train.
Ans.​

Answer 1

Answer:

600, 6hrs

Step-by-step explanation:

Total distance = 780

Journey through car = X and Journey through train = 780-X

We know that, Speed = Distance/Time

So, time taken by car = X/60kmph and time taken by train = 780-X/100kmph

Thus we derive equation as follows:

X/60 + 780-X/100 = 9

X = 180km

so, journey through car = 180km and journey through train = 780-180 = 600km

time taken by train = 600/100 = 6hrs