pls solve properly. .
Answers
Answer:
80 km/h
Step-by-step explanation:
Let speed of one train is = x
then speed of other train will be = x+5
if the distance between them after 2 hours is 90 km then they had travelled 310 kms in total
since distance = speed x time
310 = [speed of first train x 2] + [speed of second train x 2]
310 = [x*2] + [x+5*2]
310 = 2x + 2x +10
310 = 4x + 10
310 - 10 = 4x
300 = 4x
300/4 = x
75 = x
therefore,speed of first train is 75 km/h and second train is 80km/h and the speed of faster train is also 80 km/h.
Step-by-step explanation:
let the speed of train a be x per km
the speed of other train b be x + 5 per km
original distance = 400 km
distance after 2 hrs = 90 km
distance covered by both trains = 400 - 90 = 310 km
distance covered by train a in 2 hrs = 2x km
distance covered by train b in 2 hrs = 2(x+5) km
According to the question
2x + 2(x+5) = 310
= 2x + 2x + 10 = 310
= 4x = 310 - 10
= 4x = 300
= x = 300/4
= x = 75 km
thus the speed of the faster train (train b) is 75 + 5 km = 80 km