Q3. On a 120 track , a train travels the first 30 km at a uniform speed of 30 km/h. How fast must the train travel the next 90 km so as to average 60 km/h for the entire trip?
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500m/s is right !!!!!!!!!
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ᴀɴsᴡᴇʀ
ɪɴ ᴛʜᴇ ғɪʀsᴛ ᴋᴍ sᴘᴇᴇᴅ ᴏғ ᴛʜᴇ ᴛʀᴀɪɴ, ᴠ1 = 30 ᴋᴍ/ʜ
sᴘᴇᴇᴅ ᴏғ ᴛʜᴇ ᴛʀᴀɪɴ ɪɴ ᴛʜᴇ ɴᴇxᴛ 90 ᴋᴍ, ᴠ2
ᴀᴠᴇʀᴀɢᴇ sᴘᴇᴇᴅ = ᴋᴍ/ʜ = (ᴠ + ᴠ)/2
→ ᴠ2 = 90 ᴋᴍ/ʜ
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