Question

A girl rides a bicycle with a speed of 10 kilometre per hour for 2 hour and 15 kilometre per hour
for next 3 hour. Find the distance moved by her and average speed.

Answer 1

Answer:

DISTANCE COVERED = 65 KM

AVERAGE SPEED =

13KM/HOUR

Explanation:

TOTAL DISTANCE COVERED IN FIRST 2 HOUR = ( SPEED × TIME TAKEN) = 10 × 2 = 20KM

TOTAL DISTANCE COVERED IN NEXT 3 HOUR= ( SPEED × TIME TAKEN) = 15 × 3 = 45 KM

TOTAL DISTANCE COVERED IN 5 HOUR = 45 + 20 = 65 KM

AVERAGE SPEED = (TOTAL DISTANCE COVERED / TOTAL TIME TAKEN ) = 65 KM/5 =

13 KM PER HOUR

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Answer 2

Answer:

$\fbox{\sf Distance\:moved\:by\:her = 65\:km}$

$\fbox{\sf Average\:speed = 13\:km/h}$

Explanation:

$\rightarrow\sf{Distance\:moved, s = v_1 t_1 + v_2 t_2}$

$\rightarrow\sf{v_1 = 10\:km/h, t_1 = 2h, v_2 = 15\:km/h, t_2 = 3\:h}$

$\rightarrow\sf{= s = 10 \times 2 + 15 \times 3 = 20 + 45 = 65\:km}$

$\rightarrow\large\fbox{\sf Average\:speed = \dfrac{Total\:distance\:travelled}{Total\:time\:taken}}$

$\rightarrow\sf{\dfrac {65\:km}{(2 + 3)km}}$

$\rightarrow\sf{\dfrac {65}{5}}$

$\mapsto\sf{13\:km}$

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