A boy running at 10/9 th of his actual speed covers 39 km in 2 hours 20 minutes 24 seconds. Find the actual speed of the boy (approx).
15 km/hr
Given:
Distance = 39 km
Time = 2 hours 20 minutes 24 seconds
Convert time into hours:
20 minutes = 20/60 = 1/3 hour
24 seconds = 24/3600 = 1/150 hour
Total time:
= 2 + 1/3 + 1/150
= (300 + 50 + 1)/150
= 351/150 hours
= 2.34 hours
New speed:
Speed = Distance ÷ Time
= 39 ÷ 2.34
= 50/3 km/h
Given:
New speed = (10/9) × Actual speed
So,
50/3 = (10/9) × Actual speed
Actual speed = (50/3) × (9/10)
= (50 ÷ 10) × (9 ÷ 3)
= 5 × 3
= 15 km/h
Answer: 15 km/h
Important Questions from Partial Speed
How many minutes will Radha take to cover a distance of 1950 m. if she runs at a speed of 26 km\h?
A takes 6 hours more than B to cover a distance of 60 km. But if A doubles his speed, he takes 3 hours less than B to cover the same distance. The speed (in km/hr) of A is:
A man completes a journey in 10 hours. He travels the first half of the journey at the rate of 20 km/h and the second half at the rate of 30 km/h. Find the total journey he travelled in kilometres?
Aravind runs \(\frac{5}{4}\) times as fast as Bhanu. In a race, if Aravind gives a lead of 60 m to Bhanu, find the distance from the starting point where both of them will meet.
A certain distance is covered at a certain speed. If half the distance is covered in double the time, what is the ratio of the two speeds?
