Question

a train is booked to do the run between two places 55 km apart in 1 hour 20 minute if it travels for the first 30 kilometre at 36 kilometre an hour at what speed it travel for the rest of the distance in order to complete the journey in time

Answer 1

A----------------------------B
55km= AB
Total time= 1 hour 20 min
Total distance travelled= 30km
S1= 36km/hr
T1= distance travelled/S1=30/36
=5/6 hr=50min
remaining time= 40 min = 4/6 hr
remaining distance= 25km
required speed= 25/(4/6) km/hr
=25*6/4 km/hr
=150/4 km/hr
= 37.5 km/hr

Answer 2

Answer:

50km/hr

Step-by-step explanation:

distance between the two places =55 km

time booked between 2 places = 1 hour 20 minutes

at speed of 36km/h distance covered =30 km

time taken to cover the distance of 30 km

time=d/s

30/36= 5/6 h

time in minutes =5/6×60

time=50 minutes

remaining time left to continue journey on time=

1 h 20 min in min= 80 min

=80-50=30 mins

remaining distance =55-30

=25km

speed for next 25 km =

S=d/t

25/30×60km/h

50 km/h