a car travel from a to b 40 km / h and came back speed of 50 km/ h finND average speed o er journey
Answers
Answer:
Explanation:
30 and
speed of
1 cwnert to
y cwere to ko
10) IT a man
(a) A car co
* A panther
& How long w
& A car covers
7. 4 truck tr.
& A man walk.
2. A train cour
2
rs a distance
to m/s: (1 72 km/h (11) 97.2 kom/h (110) 3.6 km/h.
to km/h: (0 30 m/s (11) 10 m/s (40) 2.5 m/s.
man takes 3 min to walk down a street 258 m long, and his speed in
ar covers 300 mm 20 s. Find Its speed in km/h.
er runs at the speed of 80 km/h. What distance will it cover in 90 m
I will it take a bus travelling at 48 km/h to cover a distance of 360 m
covers 200 km in 4 hand
"ah and then another 240 km in 3 h. Find Its average speed.
k travels at 10 kmh for 3 h and at 35 km/h for 2 h. Find Its average speed.
walks 6 kmat 12 km/h and returns at 10 km/h. Find his average speed.
covers the list 100 km of a journey at 40 km/h. the next 180 km al 1
st 200 km at 50 km/h. Find (1) the total time it takes to complete the journey
average speed of the train during the whole journey.
train covers a distance of 670 km in 6 h 5 min. If it covers the first 390 km o
rney at 90 kmh. find its speed for the rest of the journey.
covers 630 km in 9 h. If it completes the first two thirds on
km/h, calculate its speed for the rest of the journey.
.. (1)
kmh, the next 180 km at 45 km/h, and
the last 200 km
(ii) the average
10. (1) A train
journey at 90 kp
(10) A busco
travel to
12. A bus travel
13. A girl wa
take (1) an hour
14. A motorcyclis
long will it take
13. A woman
rest at 5 km/h.
16. A man w
rain travemang at O kmh completes a journey in 8 h. How much faster would lt have to
vel to cover the same distance in 6 h?
travelling at 42 kmh covers a distance in 5 h. How much time would
no h. How much time would it save if it
creased its speed by 8 km/h?
ls 12 km at the speed of 3 km/h. What change should she maken
an hour less and (11) an hour more to cover the distance?
motorcyclist travels at 30 km/h and stone for
S0 kmh and stops for half an hour at the end of every 75 km. How
will it take him to cover 375 km?
man walks a certain distance in 84 min. She covers two thirds of it at 4 km/h and
5 km/h. Find the total distance she covered.
an walks at 6 km/h and runs at 8 km/h He cova
runs at 8 km/h. He covers 6 km in 50 min partly by running
and partly by walking.
) For how long did he walk? (II) What distance did he cover walking?
Answer:
see below
Explanation:
Let n be the distance between a and b. Then the total time taken would be:
t=n/40 + n/50
The total distance is 2n. So, the average speed is distance over time. Thus:
V=2n / n/40 + n/50
=400n/ 5n+4n
=400/9
= 44.44444km/hr is the average speed