A car covers half of its journey with a speed of 10ms^(-1) and the other half by 20 ms^(-1) . The average speed of car during the total journey is

A car covers half of its journey with a speed of 10ms^(-1) and the oth

1.	A car covers half of its journey with a speed of 10ms^(-1) and the other half by 20 ms^(-1) . The average speed of car during the total journey is
Answer» `70ms^(-1)` `15ms^(-1)` `13.33ms^(-1)` `7.5ms^(-1)` Solution :Let x is the total distance Time to COVER 1sthalf `=(x//2)/(10)` Time to cover 2nd half `=(x//2)/(20)` AVERAGE SPEED `=(x)/((x)/(20)+(x)/(40))=(1)/(((3)/(40)))=13.33ms^(-1)`