If a boy goes from his home to his school at a speed of 40 km/h, he reaches 10 minutes early. If he goes at a speed of 35 km/h, he reaches 5 minutes late. What will be the time taken for the journey at a speed of 35 km/h?
Answer & explanation
Correct answer: option 4
The ratio of the speed of boy,
S1 ∶ S2 = 40 ∶ 35
S1 ∶ S2 = 8 ∶ 7
As speed is inversely proportional to Time .
So , The ratio of time,
T1 ∶ T2 = 7 ∶ 8
According to the question,
1R = 15 minutes
8 units = 15 × 8 = 120 minutes
So , the boys takes 120 minutes for the journey with 35 km/h.