Question

Q1. An aeroplane covers a distance of 250 km in 20 min. Find the following:
a) its speed in km/hr
b) The time , it will take to cover a distance of 1800 km.
Q2. A 125 m long train passes an electric pole in 5 seconds. Find the speed of the train in km/hr
Q3. A 50 m long train train takes 30 seconds to pass through a 1550 m long tunnel. Calculate its speed in km/hr.

Answer 1

1. ans..
20minute=1/3 hour
a)speed=distance/time=250/1/3=750km/hr
b)when it covers a distance of 1800 m
then time=distance/speed=1800/750=2.4 he
2)125m=125/1000=1/8km
5sec=5/60×60=1/720hr
now speed of train =1/8/1/720=720/8=90km/he
3)total distance=1559+50=1600m=1600/1000=8/5km
t=30sec=30/60×60=1/120hr
now
speed=8/5/1/120=8×120/5×1=192km/hr

Answer 2

Answer:

1) answer : 750 km/hr

2) answer: 90 km/hr

3) answer : 192 km/hr