Question

Sunita 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 the school 10 minutes late. At what speed did she walk that day assuming that she did not start late from home.

Answer 1

Step-by-step explanation:

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Answer 2

The speed of Sunita is 3.5kmph

Given :

Speed of Sunita = 4kmph

The time taken to reach school = 45 mins

She was late to school by = 10 mins

Solution :

Speed of sunita = 4kmph

Time taken = 45 mins = $\frac{45}{60} = \frac{3}{4} \:hours$

Distance travelled = $\text{Speed \times Time taken } = 4\times\frac{3}{4} = 3\:km$

One day she was late by 10 mins,

Time taken = $45+10=55\:mins = \frac{55}{60} =\frac{11}{12} \:hours$

Speed = $\frac{Distance}{Time \:\:taken}= \frac{3}{\frac{11}{12} }$

$\implies\frac{3}{1} \times \frac{12}{11} \implies \frac{36}{11} \implies 3.5\:kmph$

The speed of Sunita is 3.5kmph