Question

8. Shalu cycles to her school at an average speed of 12 km/h. It takes her 20 minutes to reach
the school. If she wants to reach the school in 15 minutes, what should be her average
speed?​

Answer 1

Answer:

16 km/hr

Step-by-step explanation:

Speed=

Time

Distance

⇒Distance=Speed×Time

So, distance to the school =12km/hr×20minutes=12km/hr×

60

20

hour=4 km

So, to cover distance 4km in 15minutes,

Speed=

15min

4km

=

(

60

15

)hour

4km

=16km/hr

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Answer 2

Answer:

speed = distance/time

to find distance first

time= 20min ( convert to sec 20*60=1200sec)

Speed= 12kmph (convert to m/s , 12(5/18) )

distance= speed*time

= 12*(5/18)*1200

= 4000m

now find speed for given time 15min ,

speed= distance/time

= 4000/(60*15)

= 4.4m/s

in km/p = 16km/hr