SOLUTION: aeroplane travels at speed of 800 km/hr and reaches destination in 3 hours.If it starts 20 min late what should be its speed in km/hr so as to reach destination in time?

Question 605231: aeroplane travels at speed of 800 km/hr and reaches destination in 3 hours.If it starts 20 min late what should be its speed in km/hr so as to reach destination in time?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
distance= speed * time
800*3 = 2400 miles
20 minutes = 1/3 hours
when late, time taken = 3-1/3 = 8/3 hours
Let x be the increase in speed when it is late.
Distance = speed * time
2400 = (800+x)*8/3
7200 = 6400+8x
800=8x
/8
100 = x
The speed increase will be 100 km/h
so the speed will be 800+100 = 900 km/h

RELATED QUESTIONS
a train going with the speed of 40 km/hr reach on its destination in time. It... (answered by checkley79)

a scooterist drives at a speed of 40 km/hr and reaches his destination 5 minutes late. If (answered by lwsshak3)

A train travels 250 km at the speed of 60 km/hr and arrives ten minutes late later than... (answered by mananth)

A car travels 2 hours at uniform speed. If it will slow down to 1/2 of original speed,... (answered by josgarithmetic,lwsshak3)

If a train travels at the speed of 45 km/hr, it is late by 48 minutes. If it travels 50... (answered by ankor@dixie-net.com)

If a car starts from A towards B with some velocity. Due to some problem in the engine... (answered by rwm)

An aeroplane left 30 minutes later than it schedule time and in order to reach its... (answered by MathTherapy)

when a bus travels a certain route at an average speed of the40km/h it arrives one hour... (answered by josgarithmetic,ikleyn)

Two cars travel at the same distance. The first car travels at 40mph and reaches its... (answered by mananth)