the ratio between speed of d 2 trains is 7 8 if d 2nd train runs 400km in 4 hrs

b. 87.5 kmph
If the speed of the trains are 7x & 8x respectively
2nd train's speed(kmph)=400/4=100 =8x, x=100/8=25/2
So 1st train's speed=7x=7*25/2= 87.5
10 years agoHelpfull: Yes(18) No(0)

second train 's speed is 100km/hr. so
7/8 = x/100 ;
x = 87.5
10 years agoHelpfull: Yes(6) No(0)
speed of 2nd train = 400/4=100kmph
so speed of first train = 700/8= 87.5
10 years agoHelpfull: Yes(3) No(1)
B- 87.5
By S=D/T, When T2 travels 400km in 4hr so speed= 100km/h and with 8:7 ratio T1 gets speed of 87.5km/h
10 years agoHelpfull: Yes(1) No(0)
given speed of a and b are in the ratio 7:8 and b'speed =distance/time
a/b=7/8=>a=7/8*b
a=(7*400)/(8*4)=87.5kmph
10 years agoHelpfull: Yes(1) No(0)
speed of 2nd train = 400/4 = 100kmph
hence 7x/100 = 7/8
=> 56x = 700
=> x = 700/56
=> x = 12.5
so 7x = 7*12.5 = 87.5
10 years agoHelpfull: Yes(0) No(0)

the ratio between speed of d 2 trains is 7:8. if d 2nd train runs 400km in 4 hrs, wat is d speed of d 1st train?
a) 85kmph
b) 87.5kmph
c) 90kmph
d) 92.5kmph