Question

Rajesh participated in a 21 -km marathon. He completed 14 km in 2 hours.

Komal too participated in the same marathon. Her speed was half of that of Rajesh's speed.

If both of them ran at a uniform speed, how long did Komal take to complete the marathon?
A. 8 hrs
B. 6 hrs
C. 4 hrs
D. 1.5 hrs.

Answer 1

Answer:

Rajesh participated in a 21 -km marathon. He completed 14 km in 2 hours.

Komal too participated in the same marathon. Her speed was half of that of Rajesh's speed.

If both of them ran at a uniform speed, how long did Komal take to complete the marathon?

A. 8 hrs

B. 6 hrs

C. 4 hrs

D. 1.5 hrs.

Step-by-step explanation:

1.5hrs.

Answer 2

Given:- Rajesh participated in a 21 -km marathon. He completed 14 km in 2 hours.

Komal too participated in the same marathon. Her speed was half of that of Rajesh's speed,both of them ran at a uniform speed.

To Find:- how long did Komal take to complete the marathon?

Answer:- Total Distance = 21km .

Time for which he ran 14km = 2 hr .

Hence , the speed = Distance/time = 14km/2hr = 7km / hr .

If Komal's speed was half then , her speed = 7km /2 = 3.5km/hr .

Hence , time taken by her = 21km / 3.5km hr^-1 = 6 hours .

★ Hence the time taken by Komal is 6hrs.

→Learn more from Brainly :-

1) A marathon runners run at a average speed of 14 km/hr how long it will take to complete a distance of 142 km

https://brainly.in/question/220177?utm_source=android&utm_medium=share&utm_campaign=question

2) Select the correct sentence:

Shirish has been pursuing running as a sport for three years now. If he completes the 42 km...

https://brainly.in/question/9374379?utm_source=android&utm_medium=share&utm_campaign=question