Question

In a 5 km long marathon, Milkha Singh runs first 2 km in 10 minutes while
remaining distance in 15 minutes. Calculate his average speed in: a. Km/h

Answer 1

Answer:

$\huge{\textsf{Given}}$

• The length of circular track = 100 mtrs.
• Length of the race = 2000 mtrs.
• Total rounds taken by the athletes to complete the race = 2000/100 = 20 rounds

➺ Now,ratio of speed of the two athletes = 5:3

➺ Now,ratio of speed of the two athletes = 5:3We calculate time, using the relative speed formula,

$\large\orange{\textsf{➙ Relative Speed = Relative Distance , Time}}$

• Relative Speed = 2 (5-3)
• Relative Distance = 100 mtrs.(distance of the circular track)

$\large\orange{\textsf{➙ So, Time = 100,2 = 50 sec}}$

➻ Now, the distance covered by faster athlete in 50 sec = 50*5

➺ After running 250 mtrs. both athletes will cross eachother.

➼ Thus, In a race of 2000 mtrs after every 250 mtrs they will cross eachother, which means, they will cross eachother 2000/250 = 8 times.

Explanation:

@ItzStarBrainly

Answer 2

Answer:

average speed =total distance/total time taken

Explanation:

average speed = 5km/25/60h

= 2.8 km/hr