Question

Ritu walks to her school at a speed of 4 km per hour and takes 45 minutes to reach the school in time. One day she reached 10 minutes late. At what speed did she walk that day, assuming that she did not start late from school​

Answer 1

Given data : Ritu walks to her school at a speed of 4 km per hour and takes 45 minutes to reach the school in time. One day she reached 10 minutes late, assuming that she did not start late from school.

To find : At what speed did she walk that day ?

Solution :

• speed of ritu = 4 km/hr
• time taken by ritu = 45 minutes = 3/4 hr

Now, a/c given data;

Ritu reached 10 minutes late to the school,

Here, 10 minutes = 1/6 hr

Here;

Time taken by ritu - 1/6 hr

= 3/4 - 1/6 = 18/24 - 4/24

= (18 - 4)/24 = 14/24 = 7/12 hr ----{1}

Now,

⟹ speed = distance/time

⟹ 4 = distance/⅙

⟹ distance = 4 * 1/6

⟹ distance = 2/3 km

Now, from eq. {1}

⟹ speed = distance/time

⟹ speed = 2/3 / 7/12

⟹ speed = (2 * 12)/(7 * 3)

⟹ speed = 24/21

⟹ speed = 8/7 km/hr or 1.1428 km/hr

Answer : Hence, speed of ritu is 8/7 km/hr.

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Answer 2

Answer:

3+3/11

Step-by-step explanation:

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