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With an average speed of 40 km/hr, a train reaches its destination in time. If it goes with an average speed of 35 km/hr, it is late by 15 minutes. Find the length of the total journey?

Q: With an average speed of 40 km/hr, a train reaches its destination in time. If it goes with an average speed of 35 km/hr, it is late by 15 minutes. Find the length of the total journey?

Let the time taken by train be 't' hrs. Then, 40 t = 35 t + 15 60 40t = 35t + 35/4 t = 7/4 hrs Therefore, Required length of the total journey d = s x t = 40 x 7/4 = 70 kms.

70 kms
60 kms
45 kms
30 kms

Correct Answer: 70 kms

Explanation:

Let the time taken by train be 't' hrs.

Then,

$40 t = 35 t + \frac{15}{60}$

40t = 35t + 35/4

t = 7/4 hrs

Therefore, Required length of the total journey d = s x t

= 40 x 7/4

= 70 kms.

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