1. The speed of a boat in still water is 5 m/s. what is its speed in km / h.
2. Find the distance covered by a car moving at the 20 m/s
for 3 hour .
3. how much further can an interstate bus go by travelling at 80 kilometre / hour rather than at 75 km in 5 hours.
1 - 3 Questions are of
chapter = Time Speed and Distance
4. Amit old his cow for Rs. 7920 and gain 10% what will be the cost price of cow.
5. Selling price of 6 pens is equal to price of 7 .Find the gain percent or loss percent.
6. Piya purchased and old mobile for Rs. 1150 and spends Rs. 150 on its maintenance. If he sold the old mobile for 1500 then what is profit percentage.
7. By selling the stool for Rs 67.50 a carpenter losses 10%. How much present would he gain or loss by selling it for 82.50.
4 - 7 Questions are of the Chapter = Profit and Loss
8. 3 / 48 is what part of 1 / 12
Only 8th Question are for the Chapter = Ratio and Proportion.
9. A block of wood is in form a cube its edge is 4 metre .How many rectangular piece of dimension 20 cm × 10 cm × 5 cm can be cut from the block.
[ Chapter - Volume and Surface Area ]
Last 2 questions from chapter = measurement.
10. 107 cm is equivalent to
11. The number of seconds in 5 hour equals to the number of minutes in.
Please , Please , Please
Meri help karo ye 11 question math ke mujhe samajh me nahi a rahe han...
Please help karo...
Answers
Answer:
5 hours is equal to 5 x 60min is equal to 300 minutes
Step-by-step explanation:
1.The speed of a boat in still water is 5 m/s. what is its speed in km / h.
1000m = 1km
5m = 5/1000km
3600s = 1hr
If it goes .005km in one second, in one hour the distance it can cover = 5/1000 × 3600 km
= 5 x 3.6 km = 18km
So speed of the boat = 18km/hr
2. Find the distance covered by a car moving at the 20 m/s
for 3 hour .
Distance = Speed x Time
= 20m/s x 3hours
= 20m/s x (3x3600)seconds
= 20x10800 m in 3hrs
= 20x10800/1000 km in 3hrs
=2x108 km = 216km
The car can cover 216km in 3hours
3. how much further can an interstate bus go by travelling at 80 kilometre / hour rather than at 75 km in 5 hours.
Distance when speed is 75km/5hrs = 15km per hour
So when it goes 80km/hr it can go 80-15km further which is 65km.
4. Amit old his cow for Rs. 7920 and gain 10% what will be the cost price of cow.
Sale Price = Rs.7920
Profit = 10% = Rs.792 (when nothing mentioned, profit percentage is usually on the Sale Price rather than on the cost)
Cost price = Sale – Profit = 7920-792 = Rs.7128
5. Selling price of 6 pens is equal to price of 7 .Find the gain percent or loss percent.
Sale Price (S) = Cost Price (C) + Profit (P)
6xS = 6(C + P) = 6C + 6P
Which is equal to the Cost Price of 7 pens.
So 6C +6P = 7C.
7C-6C = 6P = C
So Profit = Cost/6
6P = C
C+P=S
C+6C =S
Or Profit = Sale/7
So profit% = 100/7% = 14.29%
6. Piya purchased and old mobile for Rs. 1150 and spends Rs. 150 on its maintenance. If he sold the old mobile for 1500 then what is profit percentage.
Profit = Sale -Cost
=1500 – (1150+150)
= 200
Profit% = 1500/200% = 7.5%
7. By selling the stool for Rs 67.50 a carpenter losses 10%. How much present would he gain or loss by selling it for 82.50.
Sale = 67.5
Loss = 10% = 6.75
Cost = Sale + Loss = 74.25
When sale = 82.5
Profit = 82.5-74.25 = 8.25
Profit% = sale/profit % = 82.5/8.25 % = 10%
8. 3 / 48 is what part of 1/12
Part of 1/12 = 3/48.
Then the part = 3/48 x 12 = 3/4
9. A block of wood is in form a cube its edge is 4 metre .How many rectangular piece of dimension 20 cm × 10 cm × 5 cm can be cut from the block.
Volume of the cube = 4^3 m^3
=64m^3
= 6400cm^3
Volume of cuboid = l x b x h = 20 x 10 x 5 cm^3 = 1000cm^3
No. Of Cuboids that can be cut from the cube = 6400cm^3 / 1000cm^3
= 6.4 which is 6 cuboids
10. 107 cm is equivalent to
1.07m or 1070mm since 100cm = 1m and 10mm = 1cm
11. The number of seconds in 5 hour equals to the number of minutes in.
No. Of Secs in 5hrs = 5×60×60 = 18000secs
18000mins = 18000/60 hrs = 300 hrs