Question

if the speed of the car id (x+7) km/hr. Find the distance covered by the cars in (x-7) hrs

Answer 1

Answer:

ᴅɪꜱᴛᴀɴᴄᴇ = ꜱᴩᴇᴇᴅ × ᴛɪᴍᴇ

ᴅɪꜱᴛᴀɴᴄᴇ = ( x + 7 ) ( x - 7 )

x ( x - 7 )+ 7 ( x- 7)

${x}^{2} \: - 7x \: + 7 \: x \: - \: 49$

${x}^{2} - 49 = 0$

x = 7 ᴋᴍ