Question

a school boy covers a 3km distance in 5 min. calculate speed- a)cm/s b)km/h

Answer 1

Distance travelled = 3 km
= 3 × 1000 × 100 cm
Time taken = 5 min = 5 × 60 seconds
= 5/60 hours
Speed = Distance/Time
= 3 × 1000 × 100 / 300
= 1000 cm/s
= 3/5/60km/h
= 36km/h

Answer 2

Speed = Distance / Time

(a) Distance = 3km = 3×1000×100cm

Time = 5 min = 5×60sec

Speed in cm/s = 300000 / 300 = 1000cm/s.

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(b) Distance = 3km

Time = 5min = 5/60 hrs = 1/12 hrs

Speed in Km/hr = 3/ 1/12 = 3×12/1 = 36 Km/hr.

:)