Question

Find the time of the following.

1. Speed = 20 cm/s Distance = 20 m

2. Speed = 10km/hr, Distance = 750m

Answer 1

Answer:

time= distance/speed

1. speed= 20cm/s= 20/100m/s = 0.2 m/s

time= distance/speed

time=20/0.2= 100 seconds

2. speed=10Km/h= 10×5/18 m/s

time=750×18/10×5= 270 sec

Answer 2

SPEED = DISTANCE/TIME

TIME = DISTANCE/SPEED

Using above formula,

1. Time = 20m ÷ 20cm/s

= 2000cm ÷ 20cm/s

= 100 sec

2. Time = 750 m ÷ 10km/hr

= 0.75 km ÷ 10km/hr

= 0.075 hr or 4.5 min