y IV III. TIMU LITE MICI5TL
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Luwulu
19. Running at an average speed of 40 km/h, a bus completes a journey in 9-hours.
How much time will the return journey take if the speed is increased to 45 km/h?
20 Factorise
Answers
The first you will need to do is write all the given values
Remember to use the speed formula(D=S×T)
Given:
D=? >we have to use this to find the
T=6 hour>distance,so that we can findhow
S=45km/h>fast must it travel to reach the >given distance in given time.
Formula:D=S×T
Calculation: D=(45km/h)*6h {h and h will get cancel,according to algebra}
D=270Km
Now that we have found out he distance we will again apply the speed formula but this time the SPEED will be left as question mark.
Given:
D=270km
T=5hour
S=?
Formula:S=D/T
Calculation:S=270km/5h
S=54km/h
Speed=54km/h
I hope this will help you. mark as Brainliest.
speed= 40km/h
time= 9 hr
distance = speed × time
= 40×9
= 360 km
if speed is 45km/HR
then also distance will be constant
so, time required will be= distance÷speed
= 360÷45
= 8 hr