फाइंड द टाइम टेकन बाय कार एक कन्वर्ट ए डिस्टेंस ऑफ 7 किलोमीटर 200 मीटर एंड स्पीड ऑफ 15 मीटर पर सेकंड
Answers
Answer:
Solution
(a) In order to calculate the speed in centimetres per second we should convert the given distance of 3 kilometres into centimetres and the given time of 5 minutes into seconds. Pleas note that 1 kilometre has 1000 metres and 1 metre has 100 centimetres. Now,
Distance travelled = 3 km
=3×1000m
=3×1000×100 cm ...(1)
= 300,000 cm
Time taken = 5 minutes
=5×60 seconds
=300s ...(2) ltBrgt We know that, Speed = Distance travelledTime taken
=300,000300s
= 1000 cm/s ...(3)
Thus, the speed of scooterist is 1000 centimetres per second.
(b) In order to express the speed in metres per second we should convert the given 3 kilometres into metres and the given time of 5 minutes into seconds. Thusk, in this case :
Distance travelled = 3km
=3×1000 m
=3000 m ...(4)
Time taken = 5 minutes
=5×60 seconds
= 300 s ...(5)
Now, Speed = Distance travelledTime taken
=3000m300s
=10 m/s
So, the speed of scooterist is 10 metres per second.
(c ) And finally, in order to calculate the speed in kilometres per hour, we should express the given distance in kilometres (which is already so), and the given time in hours. So, in this case :
Distance travelled = 3 km ...(7)
Time taken = 5 minutes
=560 hours
= 0.083 h ...(8)
We know that, Speed = Distance travelledTime taken
=3km0.083h
= 36 km/h ...(9)
Thus, the speed of scooterist is 36 kilometres per hour.
Answer:
Step-by-step explanation:
7 km 200 m in 15 m/sec
7 km 200 m = 7200 m
Speed = Distance/Time
Therefore,
Time = Distance/Speed
Time = (7200/15) sec = 480 sec = 8 min
ANSWER : The required time is 8 min.