Maths: worksheet 04
1. The distance covered in 4 s is 40m. How many minutes will
a car take to cover 1.2 km?
2. An object moved 50 m in 5 sec and 25 min in the next 10
seconds. What was its average speed?
Your work 3. Find the speed of the train in m/s, in one hour
it runs 75 km. ( follow the steps, use the formula)
Q.4. if a boy runs at a speed of 15 in 5 seconds then his
speed in km/hr would be?
Q.5. An electric train runs at a speed of 100 km/ h. and it travels from East to west, the direction of the wind is from south to north. I which direction will its smoke travel?
Let us see how we can solve the above problems
First of all read the question carefully and write down the
following details.
Step 1: what are the details given? A car covers a distance of 40 m ins 4
seconds.
Step 2: To find what Time In minutes taken by the car to
travel a distance of 1.2 km.
Step 3: Deductions from the above
a) 40 m
in 4 seconds it means 10 m in 1 second
b)
Distance Travelled is 1.2 km. We have to
convert km into m to arrive at the answer
Hence
let us convert km into m 1km is 1000m So, 1.2 km = 1.2 X 1000 =1200 m
Step 4: Formula to
be used Distance / speed = Time
Step 5: 1200 m / 10
= 120 seconds
Step 6: working 120
seconds is required to be converted into minutes (Because as per the question
we have to find out the time taken in minutes)
We know, 60 second =
1 min, hence 120 second = /60 = 2 minutes
Step 7: Answer hence,
the car will take 2 minutes to cover a distance of 1.2 km
Q.2. 50 m in 5 s and 25 m in 10 sec
Total time taken to
cover 75 m is 15 sec
Average is 75/ 15= 5
m / second
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