1 -: The speed of an aeroplane is 1.24 × 10³ km/hr. Express the distance it will travel in 4 hours 40 minutes . ( Ans = 5778.4 km )
2-: A bullet train travels at a speed of 5.6×10² km/hr. Express the time it will take to travel a distance of 5040 km. ( Ans = 9 hours )
please give me full and correct explanation because I know ans but not explanation.
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1) 1.24×10³
=1.24×(10×10×10)
=1.24×1000
=1240 km/hr
4hr 40 min
=240 min
=4.66 hr
speed=1240 km/hr
time=4.66 hr
distance = speed ×time
=1240×4.66
=5778.4 km
2)
Time =distance÷speed
Distance=5040km
Speed=5.6×10²
=5.6×(10×10)
=5.6×100
=560
5040÷560 =9
9 hours
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