Question

A man travels 2000m in 30min, 1500m in 40min & 500m
in 10 min. Therefore his average speed during the whole
journey in meter per minute is-
एक व्यक्ति 30 मिनट में 2000 मीटर, 40 मिनट में 1500 मीटर तथा
10 मिनट में 500 मीटर चलता हैं तदनुसार उसकी कुल यात्रा का औसत
कितने मीटर प्रति मिनट होगा?
S.S.C. स्नात्तक स्तरीय परीक्षा, 2011
(a) 50
(b) 60.5
(c) 55
(d) 51.5​

Answer 1

Answer:

Step-by-step explanation:

Speed = Distance ÷ time. — 1

Average speed = Total distance travelled ÷ total time taken

Part 1

Speed (v) = 25 km/h

Distance =?

Time = 30 minutes

But time is in hours,

Therefore, time = 0.5 hours

Applying the values in equation 1

25 kmph = distance ÷ 0.5 hours

Distance = 25 kmph x 0.5 hours

Distance = 12.5 km

Part 2

Speed = 40 kmph

Time = 1/3 hours

Putting the values in equation 1

40 kmph = distance ÷ 1/3 hours

Distance = 40 kmph x 1/3 hours

Distance = 13.67 km

Average speed = 12.5 km +13.67 km ÷ 0.8 hours

Average speed = 26.17 km ÷ 0.8 hours

Average speed = 32.7152 kmph