Question

a car covers 200 km in 4 1/2 h and then another 240 km in 3 1/2 h.find his avarage speed​

Answer 1

Answer:

sorry can't understand your question

Answer 2

Answer:

56.5079

Step-by-step explanation:

first of all speed at 200km in 4 1/2 h is =200÷(4 1/2)

as 4 1/2=9/2

put this above we get , 200÷(9/2)=(200×2)÷9

= 400÷9............ (1)

In the second 240 km 3 1/2 = 240÷(3 1/2)

3 1/2= 7/2

put in above we get , 240÷(7/2)=(240×2)÷7

480÷7...........(2)

average speed =[ (1) + (2)] /2 = [ 400/9 + 480/7 ] /2

= ( 400×7+480×9)/ (63×2)

= (2800+ 4320)/ (126)

= (7120/126)=56.5079

ans ...... 56.5079