If a train runs at 40 km/hr, it reaches its destination late by 10 min, but if it runs by 45 km/hr, it is late by 4 min. The correct time for the train to completethe journey is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 44 min.
Let distance = x
x/40 − x/45 = 6 min = 1/10 hr
⇒ (9x − 8x)/360 = 1/10
⇒ x = 36 km
Time at 45 km/h = 36 ÷ 45 = 0.8 hr = 48 min
Correct time = 48 − 4 = 44 minutes