The speed of the motor boat was 20 km/hr. Priya being a Mathematics student wanted to know the
speed of the current. So she noted the time for upstream and downstream. She found that for covering
the distance of 15 km the boat took 1 hour more for upstream than downstream.
(i) Let speed of the stream be x km/hr. then speed of the motorboat in upstream will be
(a) 20 km/hr (b) (20+x) km/hr (c) (20-x) km/hr
(d) 2 km/hr
(ii) What is the relation between speed ,distance and time?
(a) speed: = (distance )/time
(b) distance = (speed y/time
(c) time = speec! x distance
(d) none of these
(iii) Which is the correct quadratic equation for the speed of the current ?
(a) x2+30x-200 =0 (b) x2+20X-400 =0 (c) x2+30x-400=0 (d) x2-20x-400 =0
(iv) What is the speed of current ?
(a) 20 km/hour (b) 10 km/hour (c) 15 km/hour (d)25km/hour
(v) How much time boat took in downstream ?
(a) 90 minute
(b) 15 minute
(c) 30 minute (d) 45 minute
Answers
Answered by
6
Answer:
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Answered by
14
Step-by-step explanation:
1} .C}.20- x
2}. B }. ᴅɪsᴛᴀɴᴄᴇ = sᴘᴇᴇᴅ / ᴛɪᴍᴇ
3}. A}. x2+ 30x- 200 = 0
4 }. D }. 25ᴋᴍ/ʜᴏᴜʀ
5}.C}.30 ᴍɪɴᴜᴛᴇs ..
ʜᴏᴘᴇs ɪᴛ ᴡɪʟʟ ʜᴇʟᴘ ᴛᴏ ᴜ..
✯ BʀᴀɪɴʟʏCᴀɴᴅʏCᴜʀᴜsʜ ✯
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