the speed of a motor boat is 20 km per hour. How much time it will be take to go 85 km. say in full method
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Answered by
15
Answer:
speed = 20km/h
distance = 85km
time = distance/speed
= 85/20
= 17/4
= 4 hours 15 minutes
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1
*＊✿❀ ʜᴇʟʟᴏ ❀✿＊*
ʏᴏᴜʀ ᴀɴsᴡᴇʀ =>
sᴘᴇᴇᴅ ᴏғ sᴛʀᴇᴀᴍ = x
sᴘᴇᴇᴅ ᴏғ sᴛʀᴇᴀᴍ ᴅᴏᴡɴ ᴀɴᴅ ᴜᴘᴡᴀʀᴅ = 20 + x, 20 - x
ʜs/20-x - 48/20+x = 1
48 [ 1/20-x - 1/20+x ] = 1
[ 20+x - 20 +x / (20-x) (20+x) ] = 1/48
2x/400-x^2 = 1/48
2x/400-x = 1/48
96x = 400-x^2
x^2 + 96x - 400 = 0
x^2 + 100x - 4x - 400 = 0
x(x+100) - 4(x+100) = 0
(x-4) (x+100) = 0
x = 4, x= -100
ᴛʜᴇ sᴘᴇᴇᴅ ᴏғ sᴛʀᴇᴀᴍ = 4 ᴋᴍ/ʜ
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