A train runs with the speed of 72 km/h. It reaches its destination late by 15 minutes. However, if speed is 90 km/h, it is late by only 5 minutes. The correct time (min) to cover its journey and find distance.
Answer & explanation
Correct answer: option 1
Speed ⇒ 72 : 90
4 : 5
time ⇒ 5 : 4 ... (diff. 1 → ×10 → 10)
↓
×10
↓
50 min
Correct time = 50 - 15 = 35 min
D = 72 × \(\frac{50}{60}\) = 60 km