Question

Adam and Harry are travelling from city X to city Y in their respective cars. Adam reaches city Y in 3 hours whereas Harry reaches 45 minutes after Adam. If the speed of Harry’s car is less than Adam’s car by 12 km/hr, find the speed of Adam’s car. answer:- km/h i will mark you as brainliest

Answer 1

Answer:

Distance b/w X and Y = Z km

Adam takes time = 3 hrs

Harry takes time = 45/60 = 0.75 hrs

Speed of Adam's Car = m

Speed of Harry's Car = m - 12

$Speed$ = $\frac{Distance}{Time}$

For Adam's Car,

$m$ = $\frac{Z}{3}$

∴ 3m = Z

For Harry's Car,

$m$ $-$ $12$ = $\frac{Z}{0.75}$

$m$ $-$ $12$ = $4m$

∴ m - 12 = 4m

∴ 3m = -12

∴ m = -4

But speed cam't be negative

∴ m = 4 km/h

∴ Speed of Adam's Car = m = 4 km/h

NEED FRIENDS

Answer 2

Answer:

Distance b/w X and Y = Z km

Adam takes time = 3 hrs

Harry takes time = 45/60 = 0.75 hrs

Speed of Adam's Car = m

Speed of Harry's Car = m - 12

=  

For Adam's Car,

=  

∴ 3m = Z

For Harry's Car,

  =  

  =  

∴ m - 12 = 4m

∴ 3m = -12

∴ m = -4

But speed cam't be negative

∴ m = 4 km/h

∴ Speed of Adam's Car = m = 4 km/h