plz reply fast

plz reply fast 2. A train travels a distance of 1000 km 400 m in 15 — hours 30 minutes. What is the average speed of the train ? 3. A car is travelling with a speed of 50 — kmfh. How much time will it take to travel the distance Of 200 km 100 m ? 10 4. A boy has a cardboard of length —m and breadth —m. He wants to make 5 pieces from the cardboard by cutting and pasting. Find the area of 3 such pieces. 2 5. One seller quoted the price of 5 pens and 7 pencils as 55 — and 14 — 3 2 respectively. Second seller quoted the price of 7 pens and 5 pencils as 78 — 5 and 10 — respectively. From where should we buy ? 6. The length and breadth of a cardboard are 2 — m and 1 — m respectively. The length and breadth of a second cardboard are 3 — m and 2 — m respectively. Both cardboards are divided into 10 equal small pieces. What is the total area of a cardboard. if it is made using 5 smaller pieces from the first cardboard and 3 smaller pieces from the second cardboard ?

Dear Student
q-2
total distance traveled=1000km 400meter=1000.4 km (1km=1000m)
total time taken=1512hour and 30 minutes=312+3060=31/2+1/2=32/2=16 hour  (1 hr=60 minutes)
average speed= total distance/total time taken
avg speed=1000.4/16=62.525km/hr

q-3
speed of car=5025=2525km/h
distance=200km 100meter=200.1km  (1km=1000m)

speed=distance/time
time=distance/speed
time=200.12525=200.1×5252=1000.5252=3.970hr
 

  • 0
What are you looking for?